behave

The teacher promised a gold star to any student who behaved perfectly during the field trip.

(Chinese) 老师许诺给任何在实地考察期间表现良好的学生一颗金星。

Please behave yourself while we are visiting your grandmother's quiet house.

(Chinese) 我们在奶奶安静的家里作客时，请你守点规矩。

Scientists observed how different metals behave when exposed to extreme heat.

(Chinese) 科学家观察了不同金属在极端高温下的反应（表现）。

I don't understand why he would behave so rudely to a complete stranger.

(Chinese) 我不明白他为什么会对一个完全陌生的人表现得如此无礼。