THE old man was sitting on his string bed. But it was upside down;

老人正坐在他那上下颠倒的弹簧床上： 精细的圆腿直指天空，系在木框上的绳子已被打湿。

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The string bed in a longer frame generates more spin due to increased velocity.

因为较长的球拍可以产生较快拍头速度，所以给球的旋转也越强。

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THE old man was sitting on his string bed. But it was upside down; its finely rounded legs were pointing to the sky, and the knotted ropes strung across its wooden frame were wet.

老人正坐在他那上下颠倒的弹簧床上： 精细的圆腿直指天空，系在木框上的绳子已被打湿。

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