upsetter

例句：

1. 1.The upsetter in the office is always finding fault with everyone's work.
   办公室里的打击者总是对每个人的工作挑三拣四。
2. 2. He was an upsetter to everyone who worked for him.
   他对所有为他工作的人都是一个打击者。
3. 3. The upsetter in the story is the character who always brings trouble to the party.
   故事中的打击者是那个总是给聚会带来麻烦的角色。