You can also play with speeding up the arm forward after it exits the water to help you lengthen the stroke portion underwater.
当然你也可以加快回臂的速度，给水下多留点时间。
You can also play with speeding up the arm forward after it exits the water to help you lengthen the stroke portion underwater.
当然你也可以加快回臂的速度，给水下多留点时间。
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