How far has the plane traveled, then, in horizontal direction?
飞机飞行了多远？，在水平方向？
Well, it is just going to be the area element in a horizontal plane.
其实它是水平面的面积元素。
Processing method in platform off-horizontal plane is studied.
并研究了平台偏离水平面时的处理方法。
The door may be supported in a horizontal plane during the pull force measurement test.
在拉力测量期间，可以在水平面内对门进行支承。
The door may be supported in a horizontal plane during the pull force measurement test.
在拉力测量期间，可以在水平面内对门进行支承。
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