n.活动；行动；活跃
factivity───事实性
coactivity───协同活动
inactivity───n.不做任何事，不活动，不工作；不活泼；静止，休止状态；不放射性
reactivity───n.反应；反动
activists───n.积极分子（activist的复数）；活动分子
captivity───n.囚禁；被关
Nativity───n.耶稣的诞生；耶稣诞生图；圣诞剧；圣诞节；（人诞生时的）天宫图；出生
activate───vt.刺激；使活动；使活泼；使产生放射性；vi.激活；有活力
actively───adv.积极地；活跃地
It was a period of intense activity.───那是活动激烈的时期。
Parents encourage every activity imaginable.───父母鼓励一切可能的活动。
Economic activity often follows a cyclical pattern.───经济活动常常遵循周期性模式。
The control group did not show activity in these parts of their brains when listening to the psalm.───当对照组听圣歌时，在其大脑的这些部位没有呈现活跃现象。
Your hygiene of life will improve spontaneously because you are in phase with you even in terms of movement, activity.───你的生活将会自发地改善自身的卫生，因为你处在一个可以与你的动作相媲美的阶段，甚至是一种活动中。
And warfare is just as capable of productivity improvements as any other activity.───而战争就像人类所有其他活动一样也可以改善其“生产效率”。
The activity aims at training the children to be independent. Giving them too much help will defeat the purpose of the activity.───这项活动的宗旨是锻炼儿童自立。给予他们过多帮助，只会破坏活动的宗旨。
The risks of working in a place where volcanic activity seems to have stopped but may suddenly resume are uncertain.───工作的危险在于，此处的火山活动表面上已经停止，但可能会突然重新开始。
and work procedures ( SOP ) is often applied only to certain departments, only involves a separate specific activity.───而工作规程（作业指导书）往往只应用于某一部门，只涉及到一项独立的具体活动。
The threat of war has depressed business activity.
Any form of physical activity will invalidate the results.
Activity is the only road to knowledge.
The whole place was a scene of feverish activity.
Progress is the activity of today and the assurance of tomorrow.
Everyone is free to engage in peaceful political activity.
He watched the house for signs of activity.
The streets were noisy and full of activity.
The days that preceded were filled with activity.