Excessive deflection may damage finishes and affect normal use.
第二句
Floor vibration can make building occupants feel uncomfortable.
语速流程
默认速度听1遍；
写关键词；
-15%速度分析；
默认速度再听1遍；
立即说主干。
关键词目标
第一句：
deflection / damage / finishes / normal use
第二句：
vibration / occupants / uncomfortable
最低复述
Deflection may damage finishes.
Vibration may make occupants uncomfortable.
只要这两句说出来，就算复述完成。
⑤ 句子主干训练｜10分钟
先自己完成，再看答案。
练习1
Excessive deflection can damage architectural finishes.
填写：
主语：
谓语：
宾语：
修饰词：
练习2
Floor vibration may affect occupant comfort.
填写：
主语：
谓语：
宾语：
练习3
Proper reinforcement helps control concrete cracking.
填写：
主语：
谓语：
宾语：
补充动作：
练习4
Engineers check structural movement during normal use.
填写：
主语：
谓语：
宾语：
时间/状态：
练习5：长句
Although a structure may have sufficient strength, excessive movement can still affect its performance during normal use.
填写：
Although从句主语：
Although从句谓语：
Although从句宾语：
主句主语：
主句谓语：
主句宾语：
主句主干：
参考答案
参考答案
1
主语：Excessive deflection
谓语：can damage
宾语：architectural finishes
主干：
Deflection can damage finishes.
2
主语：Floor vibration
谓语：may affect
宾语：occupant comfort
主干：
Vibration may affect comfort.
3
主语：Proper reinforcement
谓语：helps
宾语：省略的对象，结构是 help + 动词
补充动作：control concrete cracking
有意义的核心：
Reinforcement helps control cracking.
4
主语：Engineers
谓语：check
宾语：structural movement
补充：during normal use
主干：
Engineers check movement.
5
Although从句：
主语：a structure
谓语：may have
宾语：sufficient strength
主句：
主语：excessive movement
谓语：can affect
宾语：its performance
副词：still
补充：during normal use
主干：
Excessive movement can affect performance.
⑥ Grammar｜Unit 8：Present perfect 2
今天开始 Unit 8，但只抓核心，不一次学太多。
核心问题
某种状态从过去开始，一直持续到现在。
常见结构：
have/has + 过去分词 for + 一段时间 since + 起点
for：持续了多久
for two years for three months for a long time
例句：
I have worked here for ten years. 我在这里工作十年了。
since：从什么时候开始
since 2016 since Monday since I graduated
例句：
I have worked here since 2016. 我从2016年起就在这里工作。
对比
for + 时间长度
for ten years
since + 起始时间
since 2016
不能说：
since ten years ❌
工程例句
The structure has been in service for twenty years.
The engineer has worked on this project since January.
The crack has existed for several months.
今日练习
选择 for 或 since：
I have worked here ______ ten years.
The building has been in service ______ 2005.
The crack has existed ______ several months.
We have used this design method ______ last year.
The engineer has lived in this city ______ a long time.
答案
答案：
for
since
for
since
for
⑦ 今日阅读｜25分钟
Controlling Deflection, Vibration and Cracking
Structural members must not only resist failure but also perform satisfactorily during normal use. Excessive deflection, vibration, and cracking can affect the comfort of occupants and the function of a building, even when the structure remains safe.
Deflection occurs when a structural member changes shape under load. Beams and slabs normally deflect slightly, but excessive deflection may damage finishes, affect doors and windows, or create visible unevenness in floors and ceilings.
Vibration is repeated movement caused by activities such as walking, machinery, traffic, or wind. A floor may have sufficient strength but still vibrate too much. This can make occupants uncomfortable and reduce confidence in the building.
Cracking commonly occurs in concrete and masonry. Some small cracks may be acceptable, but excessive or uncontrolled cracking can allow water to enter, damage finishes, and reduce durability. Engineers therefore control deflection, vibration, and cracking through proper member sizing, reinforcement, detailing, and construction.
⑧ 段落概括｜8分钟
第一段
段意：
结构不仅要安全，还要在正常使用中表现良好。
关键词：
safe / normal use / performance
第二段
段意：
过大挠度会损坏装修、影响门窗和楼面平整度。
关键词：
deflection / finishes / doors
第三段
段意：
振动可能影响使用者舒适度和对建筑的信心。
关键词：
vibration / occupants / comfort
第四段
段意：
裂缝需要通过构件尺寸、配筋、构造和施工进行控制。
关键词：
cracking / reinforcement / detailing
今日要求
每读完一段，立即做两件事：
用中文说一句段意；
只记两个关键词。
整篇读完后，不看文章说出至少2个段意。
⑨ 今日长难句解析
原句：
Some small cracks may be acceptable, but excessive or uncontrolled cracking can allow water to enter, damage finishes, and reduce durability.
第一部分主干
Some cracks may be acceptable.
主语：Some small cracks
谓语：may be
表语：acceptable
意思：
一些细小裂缝可能是可以接受的。
第二部分主干
Cracking can allow, damage and reduce.
更完整：
Excessive or uncontrolled cracking can:
allow water to enter
damage finishes
reduce durability
这里一个主语对应三个并列动作。
allow water to enter
结构：
allow + 人/事物 + to do
意思：
使水能够进入
类似：
Cracks allow water to enter the concrete.
意群划分
Some small cracks / may be acceptable, but excessive or uncontrolled cracking / can allow water to enter, / damage finishes, / and reduce durability.
自然翻译
一些细小裂缝可能是可以接受的，但过大或未受控制的开裂可能导致水分进入、损坏装修面层，并降低耐久性。
简化句
Small cracks may be acceptable. Large cracks may cause water damage and reduce durability.
仿写
Some movement may be acceptable, but excessive movement can damage finishes and affect serviceability.
⑩ 阅读题 Part A
Q1
What can excessive deflection, vibration, and cracking affect?
Q2
What problems may excessive deflection cause?
Q3
What can cause structural vibration?
Q4
How do engineers control deflection, vibration, and cracking?
⑪ Rewrite｜2句
1
原句：
Excessive deflection may damage finishes.
提示：
Finishes may…
2
原句：
Vibration can make occupants uncomfortable.
提示：
Occupants may…
⑫ Writing｜12分钟
任务一：纠错
Excessive deflection can damages finishes.
Floor vibration may affects occupant comfort.
Cracks can allows water to enter.
Engineers should controls excessive movement.
答案
正确答案：
Excessive deflection can damage finishes.
Floor vibration may affect occupant comfort.
Cracks can allow water to enter.
Engineers should control excessive movement.
重点：
情态动词后统一用动词原形。
任务二：because
完成：
Engineers control cracking because ______.
参考：
Engineers control cracking because excessive cracks may reduce durability.
任务三：but
合并：
A beam may have sufficient strength. It may still deflect too much.
参考
参考：
A beam may have sufficient strength, but it may still deflect too much.
⑬ Shadowing｜20分钟
今天只练四句：
Structural members must perform satisfactorily during normal use.
Excessive deflection may damage finishes and affect doors or windows.
Floor vibration can make building occupants feel uncomfortable.
Proper reinforcement and detailing help control concrete cracking.
意群
Structural members / must perform satisfactorily / during normal use.
Excessive deflection / may damage finishes / and affect doors or windows.
Floor vibration / can make building occupants / feel uncomfortable.
Proper reinforcement and detailing / help control / concrete cracking.
训练流程
-10%速度逐句；
默认速度整段；
每句练完说中文意思；
最后只复述两个主干。
最低复述：
Deflection may damage finishes. Vibration may affect occupants.
今天不要求整段无稿复述。
⑭ RA｜8分钟
Structural members must remain safe and functional during normal use. Excessive deflection, vibration, and cracking can affect building performance and occupant comfort. Engineers control these problems through proper design, detailing, and construction.
重点词：
functional
excessive
vibration
performance
occupant
construction
要求：
默认速度参考音频听1遍，自己完整录音1遍，不重来。
⑮ RS｜短句单遍训练
今天仍然6句，不加长。
第一句
Deflection may damage architectural finishes.
第二句
Floor vibration affects occupant comfort.
第三句
Small cracks may be acceptable.
第四句
Excessive cracking reduces structural durability.
第五句
Engineers control movement through proper design.
第六句
Reinforcement helps control concrete cracking.
第一轮：默认速度，单遍测试
每句听1遍后立即说。
记录：
抓关键词；
说出主干；
基本完整。
最低主干：
Deflection damages finishes.
Vibration affects comfort.
Cracks may be acceptable.
Cracking reduces durability.
Engineers control movement.
Reinforcement controls cracking.
第二轮：学习模式
看文本理解；
划三个声音块；
-10%速度跟读；
回默认速度复述。
今日目标：
抓关键词：3/6；
主干：3/6；
单遍基本完整：2—3/6；
学习后基本完整：5/6。
⑯ Speaking｜15分钟
主题
Why must engineers control deflection, vibration and cracking?
今天继续使用：
主干 → 扩展 → 完整句
第一句
主干：
Engineers control deflection.
完整：
Engineers control deflection to protect finishes and normal use.
第二句
主干：
Vibration affects occupants.
完整：
Excessive floor vibration may make occupants uncomfortable.
第三句
主干：
Cracking reduces durability.
完整：
Uncontrolled cracking may allow water to enter and reduce durability.
第四句
主干：
Proper design controls problems.
完整：
Proper design, reinforcement, and detailing help control these problems.
