This is a vector and that will be our representation of vectors.
这就是矢量，这就是矢量的，表示方法。
This is a potentially confusing representation, because the function as expressed over vectors is more general, unless its domain is explicitly restricted.
这是一个潜在的可能引起混淆的表示，因为上面以向量表示的函数更加通用，除非显式地定义了其领域。
Representation of 3d vectors and points.
表示3d的向量和点。
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