Each level places the ball in a different place with obstacles in your way.

按照你的方式，在每一关带有障碍的不同地方放置你的发射球。

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The shot now crosses the goal line 0.030 seconds (or more than 2 ball diameters) ahead of its equivalent at sea level.

而这记射门比它在海平面时一样的情况快0.030秒（或者是多过2个足球直径）。

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If the goalkeeper reacts as he would at sea level, the ball would be in the back of the net before he gets to it.

如果守门员像他在海平面时那么反应，这个球就会在他拦到之前直射入网。

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On clay, the ball bounces much higher than on other surfaces, so players have to hit the ball at shoulder level.

BBC: Clay brings tension to surface

Baines thumped the ball home to level the scores and earn his side a point from a game where they may well have thought they deserved all three.

BBC: Everton 2-2 Aston Villa

"In terms of the way I was striking the ball it was a different level to the last two tournaments - way, way better, " said Murray.

BBC: Andy Murray loses to David Ferrer at Rome Masters