It is easier to control the upper body this way and momentum seems to carry the body in the right direction.

这样更容易控制上方的身体，这种趋势看来更容易引导身体到正确的方向。

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The gear wheel is used to complete the rotation speed of the upper and lower rollers, but the rotation direction is opposite.

采用扇形不完全齿轮传动送料轮轴上的齿轮来完成，上、下滚轮的转速相同，但旋转方向相反。

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You take... you go from the upper left-hand corner to the one in this direction.

你们从。,左上角斜下,取到这里。

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"Sports involving running, cutting, jumping and quick changes in direction are associated with lower-extremity injuries, just as sports involving overhead activities usually are associated with upper extremity injuries, " explains Giangarra.

CNN: Ways to help your children stay in the game injury-free