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官方描述：
Multiplies two vectors component-wise.
Every component in the result is a component of a multiplied by the same component of b.
事实上就是两个向量相乘：
如图所示，（2，3，-1）*（1，2，1）=（2，6，-1）。
（2，6，-1）.normalized=（0.3，0.9，-0.2）
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