moan n. 呻吟聲，嗚咽聲；怨氣，牢騷；vi. 呻吟，嗚咽；（about）抱怨，發(fā)牢騷；vt. 抱怨

eg: You can't invent a moan, people have been moaning even before you were born.
你們不能發(fā)明呻吟體，因為他們早在你出生前就開始呻吟了。

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