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百靈鳥；云雀
A lark is a small brown bird which makes a pleasant sound.
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（可能帶有淘氣或危險性質(zhì)的）玩樂，玩耍，嬉戲
If you say that doing something is a lark, you mean that it is fun, although perhaps naughty or dangerous.
例句
The children thought it was a great lark...
孩子們以為這很好玩。
The chances are that the thief will be under 21 and doing it for a lark...
偷東西的很可能是個不到21歲的年輕人，干這事兒只是貪玩。
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（用于幽默地表示好笑、愚蠢或多余）演戲這玩意兒/耍筆桿子這一行
You use lark in expressions such as this acting lark and the writing lark to indicate humorously that you think an activity or job is amusing, foolish, or unnecessary.
例句
He got the part, and eventually decided the acting lark wasn't half bad.
他贏得了那個角色，一番考慮后覺得演戲這玩意兒感覺也還不錯。