A basic definition of animation is the illusion of motion, or change, created by changing an image over time.

动画的一个基本定义是通过在一定时间内改变或移动图像而产生的幻觉。

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Seismograms are recordings of ground motion as a function of time and are the basic data which seismologists use to study the waves generated by earthquakes.

振动图是用来记录地面随时间运动并且是地震学家用来研究地震波的基础数据。

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