请你以后喝茶时不要发出这种声音了。
孩子们每时每刻都能“听”到这种声音，尽管并没有人真正发出这种声音。
The children could hear it all the time though nobody said it aloud.
这种声音是怎么发出的多年以来还是一个迷。
Exactly how this sounds is produced has been a mystery for many years.
这种声音是怎么发出的多年以来还是一个迷。
Exactly how this sounds is produced has been a mystery for many years.
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