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。
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。
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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