The surface is perpendicular to gravity.
它们平面垂直于重力。
And the force is perpendicular to the arm.
力是垂直于杆。
However, this elliptical image is perpendicular to first image.
但这次的成像与前一次的垂直。
Z points toward the sky and is perpendicular to the ground plane.
值朝向天空方向，与地面垂直相交。
Do you mean how do I know that it is perpendicular to a level curve?
你想问的是，我如何知道它是和等高线垂直的吗？
We have seen that the gradient is perpendicular to the level surface.
我们已经知道，梯度是垂直于等值面的。
Then you know that the gradient of g is perpendicular to the level surface.
那么就知道了g的梯度,是垂直等值面的。
I mean when I say up, of course it is still perpendicular to the surface.
当我说向上时，它当然仍是垂直曲面的。
The force is always perpendicular to the direction of motion.
因为这个力总是垂直,于运动的方向。
And then there is the normal force perpendicular to the surface.
这个力，垂直于斜面。
Above, the camera is placed perpendicular to the train pavilion bridge.
上图中，相机的摆放与火车站的天桥垂直。
For section displays, the cutting plane is assumed to be perpendicular to this line.
为显示指定一个浏览方向，切割平面假设与这条线垂直。
Market of Chinese perpendicular website is impossible to be gobbled up by.
中国垂直网站市场不可能被一家吞噬。
The plumB line is always perpendicular to the horizontal plane.
铅垂线总是垂直于水平面的。
The plumB line is always perpendicular to the horizontal plane.
铅垂线总是垂直于水平面的。
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