缓和气氛用英语怎么说啊？

to relax a atmosphere
缓和气氛

to relax a tense or unduly formal atmosphere or social situation.
打破僵局缓和紧张或过分正式的气氛、场合

ease up the atmosphere.

break the ice. 打破冷场局面

take it easy!
无论何时都可用

ease the tension