双语例句原声例句
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R One is the position vector, r.
一边是位矢。
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And, we look at how the position vector changes.
来看看位置矢量的改变。
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So, it's the second derivative of a position vector.
它是位置向量的二阶导。
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That turns out to be a very nice way to produce vectors, given one vector, the position vector.
这或许是一个得到矢量的很不错的方法,给你一个位置矢量
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The most important vector is the position vector that tells you where the object is.
最重要的矢量是位置矢量,用来表示物体的位置
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That's the analog of the position vector.
那是和位矢相似的情况
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