1N-COUNT 破冰船 An ice-breaker is a large ship which sails through frozen waters, breaking the ice as it goes, in order to create a passage for other ships. 破冰船
2N-COUNT 打破僵局的事物;活跃气氛的话 An ice-breaker is something that someone says or does in order to make it easier for people who have never met before to talk to each other. 打破僵局的事物;活跃气氛的话
This exercise can be quite a useful ice-breaker for new groups.