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 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：
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