... forward and back 前进与后退 forward inside circle 前内圆形 forward outside circle 前外8字形 ...
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Another is divided into two separate 5 laps, 5 laps of the two alternating forward, as long as the players legs thick enough, the other did not know that the ball inside the circle 5, impossible!
另外一种是分成两个单独的5人圈，两个5人圈交替前进，只要队员腿够粗，对方根本不知道球在那个5人圈里面，防不胜防！
Once the screw turns a circle, the liquid inside the sealing chamber will be pushed forward by a pitch.
螺杆每转一周，密封腔中的液体向前推进一个螺距。
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