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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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Water in the spiral chute runs downward spiral movement and also flows in circulation transversely.
螺旋槽中的水动除作向下的螺旋运动外,还作横向的循环流动.
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Woods on a slope below an orchard may retard movement of cold air downward.
如坡地果园的下方有森林容易阻碍冷空气向下排出.
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