So thehorizontal displacements of a dam are normal as a whole. 因此,大壩水平位移變化總體上正常。
If he wants to use it as a strikeout pitch, he can add spin and get the horizontal movement you see in good sliders. 假如他想用滑球來(lái)三振打者,他可以藉由增加球的旋轉以產(chǎn)生水平位移,讓這顆球成為你所見(jiàn)到的漂亮的滑球。