练习材料：

[Day 1762 2019-07-24]

Lesson 25-2 Non-auditory effects of noise

On turning eagerly to the text, one learns that the lady was a typist who found the

sound of office typewriters worried her more and more until eventually she had to go

into a mental hospital. Now the snag in this sort of anecdote is of course that one cannot

distinguish cause and effct. Was the noise a cause of the illness, or were the complaints

about the noise  merely a symptom? Another patient might equally well complain that her neighbours were combining to slander her and persecute her, and yet one might be cautious

about believing this statement.

What is needed in the case of noise is a study of large numbers of people living under

noisy conditions, to discover whether they are mentally ill more often than other people

are. Some time ago the United States Navy, for instance, examined a very large number

of men working on aircraft carriers: the study was known as Project Anehin.

任务配置：L0+L1+L4

知识笔记：

snag    n. (尤指潜在的、意外的、不严重的) 问题，困难，障碍，麻烦; 突出物; 尖齿; 尖角; 尖刺; 香肠;    v. (在带尖的东西上) 钩住，挂破，被钩住，被挂破; 抓住; 抢先获得;

anecdote    n. 逸事; 趣闻; 传闻;

slander    n. 口头诽谤; 口头诽谤罪;    v. 口头诽谤; 诋毁; 中伤;

persecute    v. (因种族、宗教或政治信仰) 迫害，残害，压迫; 骚扰; 打扰; 为…找麻烦;

cautious    adj. 小心的; 谨慎的;

aircraft carriers    n. 航空母舰;

练习感悟：