When I fall and hit the ground.
当我跌撞在地上。
坠落后撞到地面。
The two balls fell at the same speed and hit the ground at the same time.
两个球以相同速度下落并且同时到达地面。
At night, Babe would make noises and hit the ground with his feet.
VOA: special.2009.01.24
When does it hit the ground and at what speed?"
该物体何时落地,落地速度是多少
and you've got to hit a ball which is on the ground with a sort of croquet mallets.
你要用一个类似木槌的东西去打击地上的球。
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