他向下看去，看着他倒下的敌人往下滚，一直滚下去。
Looking down, he watched his fallen enemy tumbling downwards, downwards.
我们知道水都是往下运动的，就好比如同下雨一样，但是你会发现如果在右边的水也向下运动，就会产生一个空隙，在吸管里会有一段真空部分。
We know the water moves downwards when its left to itself as in rain, but you see if it moves downward on the right that would leave a gap, vacuum a hole in the pipe.
为了要解决这个问题，你需要了解网拍面应该在背向拉拍的低 点倾斜往下，打击的手掌在这一 点 朝向下面。
To solve the problem, you need to realize that the racquet face should be tilted down at the low point of the backswing, with the palm of the hitting hand facing down at this point.
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