组合轴承单元：是一个应用于汽车上，在销售前预组装、无需调整游隙以及内圈没有大挡边的轴承单元。
UNIT bearing: an automotive bearing used that is sold as an assembled set and is non-adjustable; characterized by a cone with no large rib.
安装和运转时应特别注意调整轴承的游隙适宜。
Special focus on adjusting the clearance of the bearings right when mounting and running.
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