Downward movement is much faster than upward one.

向下移动比向上移动快得多.

《简明英汉词典》

Kuroda's splitter downward movement with spin and not gravity.

黑田博树的快速指叉球是因旋转造成下坠,而非地心引力.

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Backspin: Reverse spin imparted by striking the ball with a downward movement of the racket.

下旋: 向下挥动球拍击出的旋转球,使球回转.

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If the downward movement continues to wait and see.

如果向下动作就继续观望.

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