这是一个标准的水下蛙泳踢腿练习，因此你的眼睛要向下看，看着水底的瓷砖以确定你没有停止滑行。
As in the standard underwater breaststroke kick drill, keep your eyes down and watch the tiles to make sure they don't come to a stop.
这是一个标准的水下蛙泳踢腿练习，因此你的眼睛要向下看，看着水底的瓷砖以确定你没有停止滑行。
As in the standard underwater breaststroke kick drill, keep your eyes down and watch the tiles to make sure they don't come to a stop.
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