If you spin a top, that we know that the top will not last very long because of friction.

如果你转一个陀螺，你会发现因为摩擦力，陀螺不会永远旋转。

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They love to spin a top on the ice and watch it rotating.

他们喜欢把一个陀螺转起来并看着它在冰上转个不停。

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You do that eight billion times in your life and you can hit a good top spin backhand.

如果你把这个动作做上八十亿次,那你一定能打个漂亮的反手上旋球

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He smiled when he let rip a top-spin backhand, and he even smiled when he netted a volley.

ECONOMIST: Anyone for zzzz tennis?

That's what happens when you see the ball bounce really high at Roland Garros during a top spin rally.

BBC: SPORT | Tennis | Rules and Equipment | On the rebound

It did not affect South Africa's momentum, however, and Boucher had a century there for the taking when he tried to slog-sweep Sehwag's off-spin and top-edged a catch to slip.

BBC: Amla ton piles pressure on India