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BOOK 3 · UNIT 23

Lesson 92 — What We Know—and What We Don't

综合多来源信息并区分已知、未知和推断

完整课文

LISTEN & SHADOW

第92课配音

—句 · 约 0:00
速度

先完整听一遍，不看译文；第二遍再对照课文。

Lesson 92 — What We Know—and What We Don't

我们知道什么——又不知道什么

本课只有一个现实任务：把测试数字、两份专家意见和技术流程合成一份有不确定性标记的摘要，明确已知、未知、有限推断和下一步。

1. Before You Start

本课目标

学完本课，你能够：

  • 区分直接记录、来源判断、有限推断和未知项；
  • 用把握度词块呈现多来源综合；
  • 阻止小测试结果被外推为全面系统结论；
  • 给非专业决策者写出可核对的下一步；
  • 完成一份180—220词的证据摘要。

本课边界

本课给出Northbridge Public Library虚构300条记录测试结果。所有数字只服务教材任务，不代表真实系统性能。测试可以证明本批次发生了什么，不能证明完整目录、限制访问记录、峰值流量或任一全面迁移路径一定成功。单元在本课闭环，不形成真实采购、公开上线或后续服务承诺。

场景词汇

  • logged result 已记录结果
  • structural warning 结构警告
  • valid exception 有效例外
  • manual sample 人工抽样
  • response time 响应时间
  • peak traffic 峰值流量
  • scaling assumption 规模外推假设
  • conditional recommendation 有条件建议

2. Main Conversation

A defensible brief makes uncertainty visible instead of hiding it in footnotes

The 300-record test has finished. Robin and Keira prepare the steering group’s one-page evidence brief from the test log, the two expert notes and Mateo’s process explanation.

Part A — Separating logged results from interpretation

Robin: What we know is that all three hundred selected public records were copied into the separate test area and the source catalog remained unchanged.

Keira: The log also shows eighteen structural warnings: twelve unusual but valid date formats, four missing creator fields and two duplicate item numbers.

Robin: Can we say eighteen records were wrong?

Keira: No. We can rule out that interpretation because twelve warnings were confirmed as valid exceptions. Four records lacked creator data in the source, and the two duplicate numbers require further review.

Robin: The evidence suggests the automated checks found useful review targets, but it does not give us an eighteen-record error rate.

Keira: Correct. In the sixty-record manual sample, fifty-seven test records matched the source exactly and three had title-punctuation differences caused by one mapping rule.

Robin: That rule has now been corrected, and the same sixty records passed a second comparison.

Keira: Yes, but I’d be careful about saying the full catalog will therefore migrate accurately. This sample did not include restricted records or every description pattern.

Robin: What we don’t know yet is how many additional mapping patterns appear in the remaining records.

Keira: We also do not know whether the test response time will hold during peak public use.

Part B — Drawing the safest current conclusion

Robin: The median response time was 1.4 seconds across 120 prepared searches. Can we call the new search fast?

Keira: Only for those searches in that test environment. We can’t rule out slower performance with more users, larger indexes or different queries.

Robin: Staff recorded eleven hours of parallel review. The examples don’t represent a full migration, so multiplying eleven hours by the number of batches would be unreliable.

Keira: Exactly. Both experts agree that the safeguards worked as designed in this test. Where they differ is still the post-test migration sequence.

Robin: The safest conclusion is that the process protected the source and identified a correctable mapping rule in this batch.

Keira: Add that the test does not yet establish the best full-migration strategy, total staff time, restricted-record handling or peak performance.

Robin: A more accurate way to put the recommendation is: run a second, more varied public-record batch before choosing between phased and single cutover.

Keira: That may reduce some uncertainty, but it will not answer the restricted-record question. That requires a separate access review.

Robin: I’ll mark the completed batch and corrected rule as closed; migration sequence, scaling and restricted access remain open.

Keira: Good. The brief should let a reader see the evidence, the inference, the exceptions and the next decision without treating caution as failure.

Certainty ledger

Level Statement Basis
known 300 selected records imported; source unchanged process and test logs
known one mapping rule caused three punctuation differences and was corrected manual comparison and rerun
suggested current checks can identify useful review targets this batch’s warning review
not established full-catalog accuracy and total staff time sample and scale limits
unknown restricted-record handling; peak public performance outside test scope
next step more varied public batch plus separate access review conditional recommendation

Check the story

  1. How many structural warnings were logged?
  2. Why is that not an eighteen-record error rate?
  3. What happened in the sixty-record manual sample?
  4. What does the 1.4-second result apply to?
  5. Which four wider questions remain unresolved?
  6. What is the current conditional recommendation?
3. 中文译文需要时展开

站得住脚的简报要让不确定性清楚可见，而不是藏在脚注里

三百条记录的测试已经结束。罗宾和凯拉根据测试日志、两份专家说明和马特奥的流程解释，为指导小组准备一页证据简报。

A部分——区分日志结果和解释

罗宾： 我们知道的是，选定的三百条公开记录全部复制到独立测试区域，而且源目录保持不变。

凯拉： 日志还显示十八条结构警告：十二种不常见但有效的日期格式、四条缺失创建者字段、两个重复条目编号。

罗宾： 我们能说十八条记录错误吗？

凯拉： 不能。我们可以排除这种理解，因为十二条警告已确认是有效例外。四条记录在源资料中就缺少创建者数据，两个重复编号还需要进一步审核。

罗宾： 证据表明自动检查找到了有用的审核目标，但不能由此得出十八条记录的错误率。

凯拉： 正确。在六十条记录的人工样本中，五十七条测试记录与源资料完全相同，三条因一项映射规则出现标题标点差异。

罗宾： 该规则现在已纠正，同样六十条记录通过了第二次比较。

凯拉： 是的，但我会谨慎地说整个目录因此能准确迁移。这个样本没有包含受限记录，也没有覆盖每一种描述模式。

罗宾： 我们还不知道剩余记录中会出现多少种额外映射模式。

凯拉： 也不知道测试中的响应时间能否在公众使用高峰期保持。

B部分——得出当前最稳妥的结论

罗宾： 在一百二十次预设搜索中，响应时间中位数为1.4秒。可以说新搜索很快吗？

凯拉： 只能说那些搜索在那个测试环境中如此。用户更多、索引更大或查询不同时，不能排除速度变慢。

罗宾： 员工记录了十一小时并行审核。这些例子不能代表完整迁移，因此把十一小时乘以批次数量并不可靠。

凯拉： 没错。两位专家都同意，保护措施在这次测试中按设计工作。他们的分歧仍然是测试后的迁移顺序。

罗宾： 最稳妥的结论是，这一批次的流程保护了源资料，也发现了一项可纠正的映射规则。

凯拉： 加上测试尚未确定的事项：最佳完整迁移策略、员工总工时、受限记录处理和高峰性能。

罗宾： 更准确的建议是：在分阶段切换和单次切换之间作选择前，再运行一个内容更多样的公开记录批次。

凯拉： 这也许能减少部分不确定性，但不能回答受限记录问题。后者需要单独的访问审核。

罗宾： 我会把已完成批次和已纠正规则标为关闭；迁移顺序、规模扩展和受限访问仍保持未决。

凯拉： 很好。简报应让读者看到证据、推断、例外和下一项决定，而不会把谨慎当成失败。

确定性账簿

层级 陈述 依据
已知 导入300条选定记录；源资料不变 流程和测试日志
已知 一项映射规则造成三处标点差异，现已纠正 人工比较和重新运行
提示 当前检查能找到有用的审核目标 本批警告审核
尚未确定 完整目录准确性和员工总工时 样本与规模限制
未知 受限记录处理；公众高峰性能 测试范围之外
下一步 更多样的公开批次加单独访问审核 有条件建议

翻译提示：what we know and what we don't 要把已知、推断和未知分层表达；“尚未证明”不等于“已经证明相反结果”。

4. Read, Notice, Understand

结果、推断和未知项分层呈现

Result: 300 selected records were imported.
Inference: the safeguards worked as designed in this batch.
Unknown: peak-load performance.

三个层级都重要。把推断混入“已知”会加强结论；只列未知又会掩盖测试已经提供的有效信息。

can rule out也需要证据范围

本课可以排除“18个警告等于18条错误”，因为人工复核已确认12项为有效例外。不能排除完整目录中仍有其他映射错误。

下一步要对应具体未知项

更丰富的公开记录批次处理“更多映射模式”；单独访问复核处理“限制记录”。一个新测试不必假装能回答所有问题。

5. What People Actually Say

本课负荷说明

本课主动掌握6个把握度词块，不新增主要语法。CH519—CH542完成单元整合；CH495—CH500和GR065、GR068、GR070完成新信息包远迁移。

1. What we know is …

标出直接记录或已核实事实。

What we know is that the source catalog remained unchanged.

2. What we don't know yet is …

明确当前未知，而不是暗示永远无法知道。

What we don’t know yet is how peak traffic will affect response time.

3. The evidence suggests …

给出受材料支持但仍有限的推断。

The evidence suggests that the checks found useful review targets.

4. We can rule out …

根据已有材料排除一个明确解释。

We can rule out treating all eighteen warnings as errors.

5. We can't rule out …

说明材料仍无法排除的合理可能。

We can’t rule out slower performance with more users.

6. The safest conclusion is …

给出不超出当前证据的最可辩护结论。

The safest conclusion is that the safeguards worked in this limited batch.

Don’t Say It That Way

容易说出的句子 问题 更准确的表达
The test had an 18-record error rate. 警告不等于错误 Eighteen warnings were reviewed; twelve were valid exceptions.
The new system is fast. 受控查询外推到公开峰值 The median was 1.4 seconds for 120 prepared test searches.
The phased plan will take exactly 11 hours per batch. 从一个批次线性外推 This batch required eleven review hours; wider staffing time is not established.
The test proves the migration is safe. 无范围且“安全”未定义 The source was protected and one correctable rule was found in this batch.

6. Grammar in the Scene — Certainty Scale and Scope

L92不新增主要语法，整合来源报告、复杂被动、情态和范围限定。

1. 已知层

The log shows / The comparison confirmed / What we know is连接可核对记录。

2. 有限推断层

suggests / appears to / is consistent with需要同时标明样本：in this batch / for these searches。

3. 排除与未排除

can rule out必须指明被排除的解释；can't rule out只保留合理可能，不等于该可能很大。

4. 未知层与下一步

not established / remains unknown / requires separate review比模糊的more research is needed更可操作。

快速练习

  1. The log (shows / proves forever) that 300 records were imported.
  2. The evidence (suggests / guarantees) the checks found useful targets.
  3. We can rule ______ an eighteen-record error rate. (out / off)
  4. We can’t rule out slower performance ______ peak use. (during / since)
  5. 把The system is accurate改成带样本范围的已知＋未知。
  6. 为restricted-record handling写一个对应下一步。

7. Sound Natural — 让已知与未知听起来同样清楚

已知项使用稳定落调：

What we KNOW is / that the source remained UNCHANGED. ↘

未知项不要读得含糊：

What we DON’T KNOW YET is / how the system performs at PEAK USE. ↘

结论句重读范围：

The safest conclusion is / that the safeguards worked / in THIS LIMITED BATCH.

影子跟读

What we know is that the source remained unchanged.
The evidence suggests that the checks found useful review targets.
We can’t rule out slower performance at peak use.
The safest conclusion is limited to this batch.

8. Practice

A. 理解检查

判断正误：

  1. All eighteen warnings were confirmed errors.
  2. Three punctuation differences came from one mapping rule.
  3. The source catalog was overwritten.
  4. Peak-load performance was tested.
  5. Eleven staff hours can be multiplied reliably across the full catalog.
  6. A second varied batch is recommended before choosing a migration sequence.

B. Fact / Source judgment / Inference / Unknown / Next step

把全部结果放入五栏；每条inference必须写范围，每条next step必须指向至少一个具体未知项。

C. CH519—CH524单元R

修正：“The test proves library users prefer the new catalog and that experts agree on a phased launch.”主动调用六个限定词块，保留真实成功项。

D. CH525—CH530单元R

把本课完整信息压成90秒决策摘要。说明主要点、受众相关信息、实际意义、省略内容和不能改变的状态。

E. CH531—CH536单元R

用共同点—差异—来源—权重—不冲突—关键取舍六步比较专家意见，并加入测试后仍缺的证据。

F. CH537—CH542单元R

用通俗英语解释为何“18 warnings”不等于“18 errors”。包含有限类比、人工复核、听者无需执行的动作和重要限制。

G. CH495—CH500远迁移

写一封180词测试跟进：确认来源、当前理解、已关闭／开放项、纠错邀请和收件期限。不得把收件或未纠错视为批准全面迁移。

H. 陌生声音：Sofia的独立复核留言

先听两遍，不看文字稿。记录：

  1. 她确认哪两项测试结果？
  2. 她为何拒绝“18 errors”？
  3. 哪项性能结论仍有限？
  4. 她建议的两个下一步是什么？
  5. 用60秒向没听留言的人转述，保持来源距离。

I. 9分钟Unit 23整合

阅读长简报、两份专家意见、技术流程和测试表，依次完成：90秒摘要、双来源综合、通俗解释、把握度账本和一页最终建议。

J. 中译英情境表达

  1. 我们知道的是，原目录保持不变。
  2. 我们还不知道高峰使用会怎样影响响应时间。
  3. 证据表明，这些检查找到了有用的复核对象。
  4. 我们可以排除把18个警告全部视为错误。
  5. 我们不能排除更多用户使用时速度变慢。
  6. 最稳妥的结论是，保护措施在这个有限批次中按设计运行。

9. Make It Yours

建立一页“把握度账本”

为自己正在处理的非敏感决定写known / source judgment / inference / unknown / ruled out / cannot rule out / next step。每条必须有来源。

删除装饰性谨慎词

perhaps / maybe / possibly若没有说明“什么可能、依据是什么、为什么重要”，只会制造模糊。换成明确把握度和范围。

三天后的复测

换一份新数据表，在5分钟内写100词摘要。请同伴只根据摘要区分事实、推断和未知；若分不出，就重写路标。

10. Answer Key点击展开

Check the story

  1. Eighteen.
  2. Twelve were valid date-format exceptions, four reflected missing source fields, and two duplicate numbers still require review.
  3. Fifty-seven matched exactly; three punctuation differences came from one mapping rule, which was corrected before a successful rerun.
  4. One hundred twenty prepared searches in the test environment.
  5. Best migration sequence, total staff time, restricted-record handling and peak public performance.
  6. Run a second, more varied public-record batch and conduct a separate restricted-access review before the wider decision.

5. 快速练习

  1. shows
  2. suggests
  3. out
  4. during
  5. The sixty-record sample matched after one rule was corrected; full-catalog accuracy is not yet established.
  6. Conduct a separate access review before deciding how restricted records should be handled.

7A

  1. False
  2. True
  3. False
  4. False
  5. False
  6. True

7C参考

That’s a bit of a generalization. Positive feedback may be true for two volunteers, but the examples do not represent library users. The test also does not show that the experts agree on a phased launch; they agree on safeguards and differ on sequence. I’d be careful about using “proves” or “launch.” A more accurate way to put it is that a limited batch protected the source and identified one correctable mapping rule. We can report those results without claiming user preference or a final strategy.

7H文字稿与要点

Hello, this is Sofia, the independent test reviewer. I confirmed that all three hundred selected records were loaded into a separate test area and that the source catalog was not overwritten. The log contains eighteen structural warnings, but I would not describe those as eighteen errors: twelve were valid date exceptions, four reflected blank source fields and two duplicate numbers remain under review. The 1.4-second median applies only to 120 prepared searches in the test environment. I recommend a second batch with more varied public records and a separate access review for restricted records before the steering group selects a wider migration sequence.

要点：

  1. 300条进入独立测试区；原目录未覆盖。
  2. 警告包含有效例外、源字段为空和未决重复编号。
  3. 1.4秒只适用于120次准备好的测试搜索。
  4. 更多样公开记录批次；限制记录单独访问复核。
  5. 转述须使用Sofia confirmed / she would not describe / she recommends。

7J参考

  1. What we know is that the source catalog remained unchanged.
  2. What we don’t know yet is how peak use will affect response time.
  3. The evidence suggests that the checks found useful review targets.
  4. We can rule out treating all eighteen warnings as errors.
  5. We can’t rule out slower performance with more users.
  6. The safest conclusion is that the safeguards worked as designed in this limited batch.

开放题答案不唯一。合格最终摘要必须让读者区分直接记录、来源判断、有限推断、已排除解释、未排除可能和对应下一步。

11. Self-check

  • 我能把直接记录、来源判断、推断和未知项分层。
  • 我只在有明确依据时使用can rule out。
  • 我不会把有限性能或抽样结果外推到完整系统。
  • 我能让每个下一步对应一个具体未知项。
  • 我完成了180词跟进、陌生声音转述、9分钟整合和三天后复测。