... 等量线 equal volume contour; equality line; isobar; isocontour; isograd; isogram; isoline 通量线 elementary steam; flux lines; line of flux 向量线 line of vector; vector line ...
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It's the dot product between the normal vector of a plane and the vector along the line.
这是平面法向量，和沿直线向量的点积。
In this definition, argc is the number of arguments passed in (argument count) and argv is an array of strings representing options passed in from the command line (argument vector).
在这个定义中，argc是传递进来的参数的个数(参数数量)，而argv是一个字符串数组，代表从命令行传递进来的参数(参数向量)。
Well, at point P, the velocity vector QP is perpendicular to the line QP, 1 so the sine of that angle is one.
点P，速度向量,垂直于直线，所以该角的正弦值为。
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