... [brontide] 一种低沉的、像闷雷似的短的声音,常在活动地震区听到,一般认为是由地震引起的 [ground speed] 飞机相对于地面的速度 [topography;relief;terrian] 地面高低起伏的形势 ...
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When you have a velocity in the moving plane frame and you want to find the velocity on the ground, you should add to every object in the plane the velocity of the plane with respect to the ground.
当你在运动的飞机上运动,然后你想找到相对于地面的速度,你就应该给每个物体加上,飞机相对于地面的速度
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