Her mom also packed extra string cheese, which is a well-known social lubricant.

她妈妈还帮她做了纤丝奶酪，这是众所周知的社交润滑剂。

There's a certain amount of people who love it for the caffeine, but for a lot of people, it's a different kind of social lubricant.

有一部分人因为咖啡因而喜欢它，但对很多人来说，它不过是另一种的社会润滑剂。