如果我们以每秒约五英里的速度抛出这个球，球就不会再落回地面。

If we should throw the ball at a speed of about five miles a second, it wouldn't fall back to the ground.

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后来教练将球轻轻抛出，克塞妮亚小小的身体立即活跃起来，跑过去抓住了这个网球。

Then the coach tossed the ball lightly, and Kseniya, her small body coming alive at once, ran to catch it.

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