Movement between the ring sealing surface coated with grease to prevent the movement ring sealing surface wear in the pump drive.

动静环的密封面之间涂以润滑脂，防止动静环密封面在水泵开车前磨损。

youdao

At least one surface of the substrates is coated with a polyvinyl alcohol polymer to render the substrates resistant to oil and grease.

采用聚乙烯醇聚合物涂布基材的至少一个表面以使基材耐由和油脂。

youdao