名词
中文翻译：滑块
同义词：
['screw', 'nut', 'ball']
例句：
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1.The car has a special axle that allows it to move smoothly without any ast-pulleys.
这辆车有一个特殊的轴，可以让它平滑地移动而不需要任何滚珠。
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2.The engineer used a special tool to remove the axle and replace the ast-pulleys.
工程师使用一种特殊的工具来移除轴并更换滚珠。
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3.The old car had worn out its axle and needed to be replaced with new ast-pulleys.
旧车磨损了它的轴，需要用新的滚珠来替换。