当手触壁后，立即开始快速打腿(用手支撑池壁)，打腿时间依据之前设定好的时间。
After touching the wall, the swimmer immediately starts sprint kicking (with hands flat against the wall) for the duration of the swimmer's goal time.
在爬泳中，无论是哪一种出发跳水，入水后都要尽可能快速地打3 - 6次海豚腿。
Follow any dive in crawl stroke with from 3-6 of the fastest possible double-leg kicks.
但在做25米或50米扶板打腿时，我们期望看到快速、高频的打腿。
But when we kick 25s and 50s, we expect it to be very, very fast, very, very high kick rate.
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