四级What is most important, different layers of ocean water can act as channels for sounds, focusing them in the same way a stethoscope (听诊器) does when it carries faint noises from a patient’s chest to a doctor’s ear.
最重要的是,不同的海水层可以作为声音的通道,像听诊器一样聚焦声音(听诊器) 当它将微弱的噪音从病人的胸部传到医生的耳朵时,就会发生这种情况。
2002年6月大学英语四级(CET-4)真题
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