red herring
If you say that something is a red herring, you mean that it is not important and it takes your attention away from the main subject or problem you are considering.
As Dr Smith left he said that the inquiry was something of a red herring.
史密斯博士离开时说这次调查只是为掩人耳目。
They were using the issue as a red herring.
他们正利用这个问题来转移注意力。
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