英语语法分析

Ply yarns are usually slashed for lubrication and or smoothness.

股线通过上浆，其润滑性能和（或）表面的光滑性能可以得到改善。

Inspect bearing lubrication if the oil level is in normal level.

检查轴承是否有油，滑动轴承应检查是否达到规定油位。

Therefore, we should not lubrication oil heater is right choice.

因此，应正确选择油加热器。