练习材料：
[Day 1763 2019-07-25]
Lesson 25-3 Non-auditory effects of noise
It can be unpleasant to live even several miles from an aerodrome; if you think
what it must be like to share the deck of a ship with several squadrons of jet aircraft,
you will realize that a modern navy is a good place to study noise. But neither
psychiatric interviews nor objective tests were able to show any effects upon these
American sailors. This result merely confirms earlier American and British studies: if
there is any effect of noise upon mental health, it must be so small that present methods
of psychiatric diagnosis cannot find it. That does not prove that it does not exist: but it does
mean that noise is less dangerous than, say, being brought up in an orphanage -- which
really is a mental health hazard.
任务配置：L0+L1+L4
知识笔记：
aerodrome n. 小型飞机场;
squadrons n. (空军或海军的) 中队;
jet aircraft n. 喷气式飞机;
psychiatric adj. 精神病的; 精神病学的;
hazard n. 危险; 危害; v. 冒失地提出; 冒险猜测; 冒…的风险; 使处于危险;
练习感悟：
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