1 N-COUNT 非常容易的问题;容易作出的决定 If you describe a question or decision as a no-brainer, you mean that it is a very easy one to answer or make. 非常容易的问题;容易作出的决定 [US, informal]
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If it's illegal for someone under 21 to drive, it should be illegal for them to drink and drive. That's a no-brainer.
如果不满21岁开车是违法的，那他们酒后驾车也应是违法的，这非常容易理解。
2 N-COUNT 愚蠢的人(或行为) If you describe a person or action as a no-brainer, you mean that they are stupid. 愚蠢的人(或行为) [US, informal, disapproval]
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