对曲柄摇杆机构极限位置进行运动倒置分析，作出相应辅助圆，从而设计出满足条件要求的机构。
Analyzing the motion inversion of the limit of the crank rocker mechanism, drawing the relative supplementary circle, and designing the mechanism up to requirement.
但是疑问仍然存在：你能始终一致有力量地击出那四种球吗？我尝试想说的是：许多运动员本末倒置。
But the question still remains: Can you consistently hit those four shots with power. What I'm trying to say is: many players put the cart before the horse.
我尝试想说的是：许多运动员本末倒置。
What I'm trying to say is: many players put the cart before the horse.
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