It goes up, stays in the air for a very long time, but it falls on your head.
它先上升 在空中停留很长时间,但是它会直接落在头上
You see how long you are in the air and the whole time you are in the air, you are traveling horizontally at this speed.
你可以知道在空中停留的时间,当你在空中运动的时候,你一直以这个水平速度在运动
That's how long you are in the air.
那就是在空中停留的时间
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