This is the vertical direction y.
这个是垂直的，Y轨道。
It's the unit vector in the vertical direction.
即竖直方向的单位向量。
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。
Protection of vertical and cross direction is proposed.
提出了相应的纵向和横向的保护。
Protection of vertical and cross direction is proposed.
提出了相应的纵向和横向的保护。
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