force, strong push力, push, move away推, pull, bring near拉, swing, move back摆动, skier, ski person滑雪者, forward, to the front向前, backward, to the back向后, skaters, people skating滑冰者, spin, turn around旋转, fall over, fall down摔倒, balance, stay steady保持平衡, down, to below向下, connect, join together连接, rub, move together摩擦, friction, rubbing force摩擦力

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