The plane is flying a contrary direction.
飞机正向相反的方向飞去。
And for each direction, I have a plane.
对于每个方向，都有一个平面。
How far has the plane traveled, then, in horizontal direction?
飞机飞行了多远？，在水平方向？
Well, it's the direction that's perpendicular to this plane.
它其实是朝垂直于平面的方向。
The plane moves in one direction while the conveyer moves in the opposite direction.
翻译：飞机朝一个方向移动（所以，飞机并未固定），传送带朝反方向移动。
All satellite image are tangent plane projection obtained along the flight direction of satellite.
卫星图像都是沿卫星飞行方向而获取的切平面投影图像。
The plane was flying in a northerly direction.
那飞机在向北飞行中。
Rolling direction perpendicular to the plane of the bus for the straight line roller.
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.
在垂直于滚动方向的平面内的母线为直线的滚道。
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