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So i and j are vectors of length one, pointing along x and y.
和 j 是模长为1的矢量,分别指向 x 轴和 y 轴方向
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$firstVoiceSent
- 来自原声例句
So i and j are vectors of length one, pointing along x and y.
和 j 是模长为1的矢量,分别指向 x 轴和 y 轴方向
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