1997年的夏天，美国拥有的大量的水下麦克风，或水听器，检测到一种奇怪的声音。
IN the summer of 1997, an array of underwater microphones, or hydrophones 【 1 】, owned by the US government picked up a strange sound.
但幸好，当他们被抓住的时候，他们会发出一种很容易辨识的声音----所以下次你吃双层汉堡之前一定要先仔细地听一听有没有什么奇怪的声音。
The good news is, they tend to make a very distinct grunting noise when they've been captured—so just be sure to listen carefully to your next double cheeseburger.
“如果你把随身听耳塞当成一种掩盖环境声音的方式，那就是太响了”，劳赫博士指出。
"If you use iPod earbuds as a way of masking out environmental sound, it's probably too loud," Dr. Rauch said.
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