brainless的意思|示意

That was a pretty brainless thing to do.

那样做很愚蠢.

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Brainy students box , will always pick their teachers'brains, but the brainless ones never do that.

聪明敏锐的学生会经常向他们的老师详细讨教, 但愚钝的就从来不会做这个.

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For instance, it appears the ancestor of brainless starfish and sea urchins had a brain.

例如, 无脑海星和海胆的祖先似乎曾有大脑.

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