返回这个向量的长度（只读）。

Returns the length of this vector (Read Only).

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如果两个向量的长度是相同的，它很容易。

If the two vectors are the same length, it is easy.

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获取此向量的长度。

The length of this vector.

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它可以是曲面上想要的任意长度的法向量。

It can be a normal vector of any length you want to the surfaces.

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这是与N长度相同的法向量，只是符号不定。

This is a normal vector of the same length as n, well, up to sign.

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这是长度为1的正交向量的性质。

This is a property of orthogonal vectors of length 1.

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长度相等且方向相同的向量叫做相等向量。

Vectors with the same size and the same direction are called equal vectors .

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长度相等且方向相同的向量叫做相等向量。

Vectors with the same size and the same direction are called equal vectors .

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