upon her best behavior

• adj. 行为检点(规矩)

upon her best behavior的用法和样例：

例句

用作形容词 (adj.)

1. You must be circumspect in your public behavior.
   你在公共场合必须行为检点。
2. There was no inducement for her to behave better.
   无法诱使她行为检点一些。