1. 脑；大脑
    Your brain is the organ inside your head that controls your body's activities and enables you to think and to feel things such as heat and pain.

    e.g. Her father died of a brain tumour.
           她父亲死于脑瘤。

2. 头脑；智力
    Your brain is your mind and the way that you think.

    e.g. Once you stop using your brain you soon go stale...
           一旦停止用脑，人很快就会变得迟钝。
    e.g. Stretch your brain with this puzzle.
           用这个智力游戏锻炼你的思维能力。

3. 智力；智慧；头脑
    If someone has brains or a good brain, they have the ability to learn and understand things quickly, to solve problems, and to make good decisions.

brain的翻译

    e.g. They were not the only ones to have brains and ambition...
           并不是只有他们聪明、有志向。
    e.g. I had a good brain and the teachers liked me.
           我很聪明，老师们都喜欢我。

4. 智囊；出谋划策者
    If someone is the brains behind an idea or an organization, he or she had that idea or makes the important decisions about how that organization is managed.

    e.g. Mr White was the brains behind the scheme...
           怀特先生是该项计划的幕后策划者。
    e.g. Some investigators regarded her as the brains of the gang.
           一些调查员认为她是该团伙的决策者。

5. 猛击…的头部
    To brain someone means to hit them forcefully on the head.

    e.g. He had threatened to brain him then and there.
           他当时就威胁要打爆他的脑袋。

6. 把…的脑袋打伤；把…脑袋打开花
    To beat someone's brains out or bash their brains in means to hit their head very hard, so that they are badly injured or killed.

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    e.g. 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。

7. （用枪）把…的脑袋打开花；射中…的头部
    To blow someone's brains out means to shoot them in the head, killing them.

brain在线翻译

    e.g. Give me all your money or I'll blow your brains out...
           把你所有的钱都给我，否则我就一枪把你的脑袋打开花。
    e.g. He blew his brains out with a shotgun.
           他用一支猎枪射中了他的脑袋。

8. 一直想着；对…念念不忘
    If someone has something on the brain, they keep thinking about it.

    e.g. You've had chess on the brain since you were little.
           你从很小的时候就对下棋产生了浓厚兴趣。

9. 请教；讨教
    If you pick someone's brains, you ask them to help you with a problem because they know more about the subject than you.

brain

    e.g. Why should a successful company allow another firm to pick its brains?
           为什么一个成功的企业就得允许别的公司来讨教呢？

10. to rack your brains -> see rack