moan n. 呻吟声，呜咽声；怨气，牢骚；vi. 呻吟，呜咽；（about）抱怨，发牢骚；vt. 抱怨

eg: You can't invent a moan, people have been moaning even before you were born.
你们不能发明呻吟体，因为他们早在你出生前就开始呻吟了。

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