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If you describe someone as a smart aleck, you dislike the fact that they think they are very clever and always have an answer for everything. 自作聪明的人; 自以为什么都懂的人
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Two driven and smart-aleck kids, they had taken on an extraordinarily demanding schedule of Pre-Algebra, and Advanced Language, amid a variety of extra-curricular activities.
For my friend, the Oscars are sacred, a Super Bowl Sunday, and she wants to hear and linger upon every spoken word, and can't stand the thought of a smart-aleck interrupting the broadcast.