Acceleration is the easiest thing to measure of these three quantities.
加速度是这三个量中,最容易测量的
耶鲁公开课 - 基础物理课程节选
We're talking about quantities both starting at two and going to three.
这里讨论的是,从2到3的变化量。
麻省理工公开课 - 热力学与动力学课程节选
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