No propulsive forces can be created in a long, side, stretched position and consequently, if that position is held, a swimmer will slow down due to the presence of only resistive forces.

 
  • 一个长的,伸展的身体形状不可能产生推进力,反而会由于保持这样的姿势使身体只能产生阻力而速度减慢。
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