物理量来描述一个物体的特征。

We often use physical quantity to describe the features of an object.

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上世纪60年代，物理学家从理论上推导出一个数学公式，可用于描述任意数量任意形状物体的卡西米尔力效应。

In the 1960s, physicists developed a mathematical formula that, in principle, describes the effects of Casimir forces on any number of tiny objects, with any shape.

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而且他们都描述说他们看到的是一个巨大的三角形物体在完全静默地飞行。

And they all described what they saw as a massive triangular object flying in total silence.

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Because any velocity I ascribe to a particle or an object, you will add a certain constant to it by the law of composition of velocity.

因为我描述的任何一个质点或者物体的速度,你都要根据速度叠加法则,给它加上某个常数

耶鲁公开课 - 基础物理课程节选

So what we would like to do is to describe what the object does by drawing a graph of time versus space and the graph would be something like this.

然后我们要做的就是描述这个物体的运动,通过画一个"x-t"图,画出来的图就像这样

耶鲁公开课 - 基础物理课程节选