know each other very well

• 彼此很熟识

know each other very well的用法和样例：

例句

1. That's not the case here, because I actually often have a hard time recognizing reco-rdings that I thought were very familiar to me.They sound that different and new.
   但在参考一中却不适用这个说法，因为我经常花很多时间去听唱片所以很熟识，但参考一的声音却是完全不同。