| 单词 | be on one's best behavior |
| 释义 | be on one's best behaviorphr.⇨be on one's good [best] behavior① （非常）小心以表現良好的行為，行為檢點，很守規矩He was on his best behavior and set an example to others.他行為檢點，為他人樹立了榜樣。 |
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