ice·break·er
noun/ˈaɪsbreɪkə(r)/
/ˈaɪsbreɪkər/
- a strong ship designed to break a way through ice, for example in the Arctic or Antarctic
破冰船 - a thing that you do or say, such as a game or a joke, to make people feel more relaxed, especially at the beginning of a meeting, party, etc.
（会议或聚会等场合，尤其在开始的时候）活跃气氛的游戏（或笑话等）