round bearing
... roller step bearing滚柱止推轴承 round bearing转动件轴承 rubber bearing橡胶轴承 ...
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轴承：在机器结构中，允许被连接件彼此相对转动或作直线运动的连接器(通常为支撑物)。
Bearing: in machine construction, a connector (usually a support) that permits the connected members to rotate or to move in a straight line relative to one another.
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