做蠢事：shoot oneself in the foot
單字補充：
tendency (n.c) 傾向
awkward (adj.) 奇怪的
本日例句：
Bob has a tendency to shoot himself in the foot by saying awkward things at the wrong time.
Bob很容易做白目的事情。他常在不對的時間說些奇怪的話。
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