Computer simulated the any point trajectory of the box under different conditions.

计算机模拟出筛箱上任意点在不同条件下的运行轨迹。

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And, the line is the trajectory of a point as time varies.

这条直线可以看做是点随时间运动的轨迹。

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So, now, let's try to paint, actually, the trajectory of a point.

现在我们来描绘一下点的轨迹。

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So, think of a line as the trajectory of a moving point.

把直线看作运动点的轨迹。

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So, think of a line as the trajectory of a moving point.

把直线看作运动点的轨迹。

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