A rubber band can be elongated to several times of its normal length.
橡皮带能拉长到平常长度的几倍。
It can be a normal vector of any length you want to the surfaces.
它可以是曲面上想要的任意长度的法向量。
This is a normal vector of the same length as n, well, up to sign.
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.
这是与N长度相同的法向量，只是符号不定。
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