However, increasing the velocity at a given spin reduced the lift coefficient.

但是，旋转速度不变的情况下增加球速会降低升力系数。

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In addition, spin-bearing life is sharply reduced at higher operating speeds .

此外，在较高的运行速率时，自转轴承的寿命急剧下降。

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The bats have changed dramatically, with the pimpled side, used to return an opponent's spin with venom, reduced drastically by International Table Tennis Federation rules.

BBC: Table tennis plays by the rules

In the lab, the contraption has seven degrees of freedom, but it was reduced to five when we took it for a spin.

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