lubricant

润滑剂、润滑油

Apply a little lubricant to the chain before your next ride.

下次骑车前，先在链条上涂一点润滑油。

润滑液

The pharmacy sells water-based lubricant on the lower shelf.

药局的下层架子上有卖水性润滑液。

润滑剂、缓和剂比喻

A few drinks often act as a social lubricant at these events.

在这类场合，几杯酒常常成为社交的润滑剂。

润滑的技术

The machine needs a thin lubricant film between the moving parts.

这部机器的活动零件之间需要一层薄薄的润滑油膜。