The takeoff is in essence an action that creates vertical speed.
踏跳动作的实质是创造垂直速度的过程。
At last he turned that speed straight up into a long vertical slow-roll.
最后他改变速度，来一个长时间的垂直慢滚。
The speed of vertical rope climbing was also reduced.
垂直爬绳的速度也降低了。
Because the vertical fly kick is where you get the frequency or speed of kick.
因为立蝶能提高打腿的频率或者说打腿的速度。
Because the vertical fly kick is where you get the frequency or speed of kick.
因为立蝶能提高打腿的频率或者说打腿的速度。
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