当人们听到这个音调醒来时，他们预期会闻到一股臭味，都屏住了呼吸。
Once awake when hearing the tone, the people held their breath in anticipation of a bad smell.
另外，当入睡困难的人们半夜醒来时，他们常常会开始担心是否能够再睡着。
In addition, when people with sleep difficulties wake up during the night, they often start worrying about whether they will get back to sleep.
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