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It's the unit vector in the vertical direction.
即竖直方向的单位向量。
youdao
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May be in the level, tilt and vertical upward direction of transportation of materials.
可在水平、倾斜及垂直向上的方向输送物料。
youdao
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May be in the level, tilt and vertical upward direction of transportation of materials.
可在水平、倾斜及垂直向上的方向输送物料。
youdao