So multiplying a vector by a number means stretch it by that factor.
所以用数字乘以矢量,就相当于将它伸长了相应的倍数
耶鲁公开课 - 基础物理课程节选
We know that because you can stretch i by whatever factor you like.
因为你可以让 i 伸长任意的倍数
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