good brain：好脑子

brain的典型含义是生理器官，但也常用来表达“思考能力”，如

【例句1】Teachers spotted that he had a good brain at an early age. (老师们很早就发现他天资聪颖。)[牛津高级学者辞典]

【例句2】She has a good brain for mathematics. （她在数学方面很有天分。）[牛津高级学者辞典]

【例句3】I had a good brain and the teachers liked me. （我脑子灵光，老师们都很喜欢我。）[柯林斯高级学者辞典]

更夸张一点用amazing, 如

【例句4】Marie has an amazing brain (= is very intelligent). （玛丽天资过人（= 十分聪慧）。） [剑桥高级学者辞典]

如果brain不与整体人关联，甚至可以用much, 如

【例句5】It doesn't take much brain to work out that both stories can't be true. （但凡动点脑子就能明白，两种说法不可能同时属实。） [牛津高级学者辞典；注意否定，用few肯定也不合适]

用你的脑子是use your brain, 如

【例句6】Come on, use your brain, John. (约翰，动动脑筋啊。) [朗文当代英语词典]

【例句7】That can't possibly be the right way to do it - use your brain! （这么做肯定行不通，好好琢磨下！）[剑桥高级学者辞典]

【例句8】Once you stop using your brain you soon go stale. （一旦疏于动脑，思维很快就会变得迟钝僵化。） [柯林斯高级学者辞典]

stretch one's brain含义是“拓展思维、开动脑筋锻炼脑力”，如

【例句9】Stretch your brain with this puzzle. （用这道益智谜题，锻炼脑力。）[柯林斯高级学者辞典]

keep one's brain ticking over的含义是“保持头脑灵活、勤于思考防迟钝”，如

【例句10】It's important to keep your brain ticking over. （常动脑保持思维活络十分关键。）[牛津高级学者辞典]