求翻译：利用摩擦力较小出杆时杆头击中母球的下部，从而使母球旋转的方向与前进方向相反。在母球碰触到目标球是，母球前进的力会减小，从而摩擦力相对较大。是母球产生后退的力。俗称缩杆。是什么意思？

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Use a friction-under-par at a relatively small club head hit the lower part of the ball, so that the ball spins in opposite direction and orientation. In the ball touch the ball, the ball is moving forward, it will reduce the friction and thus relatively large. The ball is back from the edge. Common

Is small using the friction force when the pole the rod head hits the female ball the lower part, thus causes female ball revolving the direction and the direction of advance is opposite.Bumps in the female ball touches the goal ball is, the female ball advance strength can reduce, thus friction for

Using friction when the smaller Club Heads hit the lower portion of the seed, so that the direction of rotation of the ball and driving in the opposite direction. The cue ball touches the object ball is that seed advancing force decreases, so friction is relatively large. Is seed produced back force

Pole bottom whom head hit mother ball utilize friction to be little to produce pole, thus make mother direction that ball rotates opposite to direction. It is to touch reaching the goal ball in mother's ball, the strength that mother's ball advances will be reduced, thus the friction is relatively g