The cover is the moving satellite's projection to the surface of the earth.
卫星覆盖是卫星运动在地球表面的投影。
PERSPECTIVE PROJECTION of the surface of a sphere onto a plane.
球面曲面到平面上的透视投影。
A projection of the top surface can be seen on the left.
顶部的投影在左边能看到。
A projection of the top surface can be seen on the left.
顶部的投影在左边能看到。
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