设ab垂直于CD。
它其实是朝垂直于平面的方向。
Well, it's the direction that's perpendicular to this plane.
所以这个外积还是垂直于同一个平面。
我们已经知道，梯度是垂直于等值面的。
We have seen that the gradient is perpendicular to the level surface.
它这样旋转，垂直于圆盘。
And so it was rotating like this and was perpendicular to the disk.
现在，垂直于同一个平面的，有两个方向。
Now, there's two different possible directions that are perpendicular to a plane.
或许你可以画出每点都垂直于向量场的曲线。
You might be able to draw curves that are perpendicular to it.
它们平面垂直于重力。
这个力，垂直于斜面。
And then there is the normal force perpendicular to the surface.
所以，我们要怎么找，垂直于这个平面的向量？
So, how do we find this vector that's perpendicular to the 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。
力是垂直于杆。
在垂直于晶须生长方向上没有层错的存在。
There was no stacking fault in the direction perpendicular to the growth orientation.
转动调节撑杆调节套使升降杆垂直于地面；
To turn the adjusting sleeve, make the mast vertically on the ground.
松质骨孔隙率在垂直于轴向的方向基本不变。
The cancellous bone porosity basically keep constant along the transversal direction.
劈板斧有垂直于斧柄的厚刃的劈东西的工具。
A cleaving tool having a heavy blade set at right angles to the handle.
从侧面观察，骹骨坚实，几乎是垂直于地面的。
Pasterns firm and nearly straight when viewed from the side.
在垂直于滚动方向的平面内的母线为直线的滚道。
Rolling direction perpendicular to the plane of the bus for the straight line roller.
使用所有的方法，在测量任意一个点都要垂直于表面。
Then use all means at your disposal to measure each point perpendicular to the surface.
这个效应表明，有一种垂直于圈平面的力作用在磁极上。
The action of the negative pole of a magnetic needle is just as real as the action of the positive pole .
机械样件的制备切割：从垂直于电缆的方向切断压接样品。
MECHANICAL sample PREPARATION CUTTING: the sample is cut vertically to the cable axis.
为了避免这个，保持你的脚垂直于你的身体，不是在前或是在后。
To avoid this, try to keep your feet under your body, not ahead or behind it.
之所以有此需要，是因为所加载荷通常是垂直于校准装置平面的。
This is necessary because the loads are usually applied normal to the calibration fixture surface.
由于底部成长模式与推挤效应两者之作用，奈米碳管因而能整齐排列垂直于基板。
The well-alignment of tubes is due to the base growth mode and the jostle effect.
由于底部成长模式与推挤效应两者之作用，奈米碳管因而能整齐排列垂直于基板。
The well-alignment of tubes is due to the base growth mode and the jostle effect.
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