答案：
The insurance company tested the new iPhones through its breakability drop tests, which include dropping the devices on a rough sidewalk from six feet high.
A list of commonly encountered normal structures that are often misinterpreted as pathological (pathologic) ones is provided in Table 21.1.
语言点：
易碎性：breakability
跌落测试：drop test
人行道：sidewalk
粗糙：rough
包括：include doing sth.
语法要点：定语从句
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1.定语从句：由关系代词 who, whom, whose, that, which;
（下面十个句子请读 5遍并脱口译出！）
1. The death notices tell us about people who have died during the week.
2. The man (whom) you spoke to just now is my friend.
3. The building whose lights are on is beautiful.
4. Please find a place which we can have a private talk in.
5. The knee is the joint where the thighbone meets the large bone of the lower leg.
6. He still remembers the day when he went to school.
7. It is no need telling us the reason why you didn't finish it in time.
8. He has three sons, two of whom died in the war.
9. Mr. Smith, whose wife is a clerk, teaches us English.
10. In the Sunday paper there are comics, which children enjoy.
2.只能用that和who引导的定语从句
A．all, nothing, anything, a few, one做先行词指物时
B．先行词前有形容词最高级修饰时，后面常跟that而不是wh
C．先行词前有 the only, the first, the last, the next, the very等词修饰时，引导词只能用that。
D．当先行词是 anyone, anybody, everyone, everybody, someone, somebody时，后面要用who或who
● All that glitters is not gold. 闪光的并非都是金子。
3.as 引导定语从句
as 引导的定语从句有两种形式：
A．引导限制性定语从句。
在此类定语从句中，as常与主语中作为其先行词的such, the same或as联用构成，“such... as”，“the same... as”和“as ...as”句型，可代替先行词。
例如：We hope to get such a tool as he is using. 我们希望得到他正在用的那种工具。
B．as 引导非限制性定语从句时，作用与which相同，as
（这是语法考试的一个考点。）
［注意区别］：
as 引导的从句用于句首、句中或句后，而which引导的定语从句不
例如：As is reported, a foreign delegation will visit the city.
选择“Disable on www.wenxuecity.com”
选择“don't run on pages on this domain”
