red herring
noun [ C ] uk/ˌred ˈher.ɪŋ/ us/ˌred ˈher.ɪŋ/
转移注意力的事情（或想法、话题）
a fact, idea, or subject that takes people's attention away from the central point being considered
The police investigated many clues, but they were all red herrings. 警方调查了很多线索，但那都是些转移他们视线的信息。