Ⅰ. head 指外表看得见的，有形的“头”。如：
Don’t hit the boy on the head. 别打那孩子的头。
Ⅱ. brains 指抽象的，无形的“脑力、智力”。
use one’s head 和 use one’s brains含义基本相同。brains 常作单数看。
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