brain
单词辨析：
普通用词，指人的思维或感知、想象等能力，无褒贬之意。
He has a sharp mind.
他头脑灵活。
His brilliant mind contributed to his great success.
他非凡的智慧助他取得巨大的成功。
指能理解思考和快速学习的能力，通常用复数。
If you had any brains, you'd know what to do next.
如果你有点脑子，你就会知道接下来要做什么。
He wanted to find a job that didn't require too much brains.
他想找一份不需要动太多脑筋的工作。
指学习、理解、思维、判断等的能力，也指聪明、聪慧。
an intelligence test
智力测验
intelligence quotient
（IQ）智商
Did your child show high intelligence from an early age?
你的孩子从小就显示出了很高的智力水平吗？
In his opinion, only a woman who has both beauty and intelligence can be his wife.
在他看来，只有秀外慧中的女子才能成为他的妻子。
指思维敏捷并能作出正确判断的能力，强调机敏，通常用复数。
He needed all his wits to escape from the heavily guarded island.
他需要绞尽脑汁逃离重兵把守的小岛。
The first piece of advice is to keep your wits about you.
第一条建议就是要随机应变。
相关例句：
He had threatened to brain him then and there.
他当时就威胁要打爆他的脑袋。
They stood over him with clubs raised as if to beat his brains out.
他们举着棍子监视着他，好像要揍扁他的脑袋。
The reason for this is that the optic nerve is a part of the brain.
这其中的原因在于视神经是大脑的一部分。
I had a good brain and the teachers liked me.
我很聪明，老师们都喜欢我。
Her father died of a brain tumour.
她父亲死于脑瘤。
I suppose the shock had addled his poor old brain.
我估摸这个打击已经把他那可怜的脑袋瓜搞糊涂了。