point perpendicular curve
点垂直曲线
以上为机器翻译结果，长、整句建议使用 人工翻译 。
That means a vector that is at every point of the curve perpendicular to the curve and has length one.
也就是，曲线每一点上,垂直于曲线，模长为1的向量。
youdao
Crosshairs appear to indicate the perpendicular and tangent lines that extend from any point on the curve.
光标仅沿着曲线移动，十字准线显示指定的垂足和切线扩展到曲线的任意一点。
应用推荐
模块上移
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