活动的英文：
activity
exercise
behavior

参考例句：

movable vice jaw
活动钳口

Active border
活动边框

Animated graphics
活动图像

Sliding partitions
活动滑板

She is an active participant in this activity.
她积极参与这项活动。

the works of a clock
钟的活动部件

This will put a stay on their activities.
这将制止他们的活动。

Move around; move about
活动;活跃;迁移

In quest of adventure
寻求冒险活动

A nocturnal animal
夜间活动的动物

activity是什么意思：
n. 活动；活动力；行动

She is an active participant in this activity.
她积极参与这项活动。

They are union actives.
他们是工会积极分子。

contamination activity
污染放射性

exercise是什么意思：
n. 运动，锻炼；练习，习题
v. 锻炼，操练，练习

The exercise is that difficult!
练习题那么难！

morning exercises and setting - up exercises duringthe break
早操和课间操

Exercise stimulates the flow of blood.
锻炼促进血液循环。

behavior是什么意思：
n. 行为；举止；态度

changeable behavior.
可改变的行为

Be on your good behavior, now.
你要放规矩点。

His behavior was beyond bearing.
他的行为令人忍无可忍。