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She hid her worries behind an air of insouciance.
她掩饰着自己的烦恼，表现得无忧无虑。
《牛津词典》
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The very direness of this possibility has produced a certain insouciance.
这种可能性的可怕已经产生了某种漠不关心。
youdao
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The very direness of this possibility has produced a certain insouciance.
这种可能性的可怕已经产生了某种漠不关心。
youdao