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head; brains
intellect; understanding
彼は頭脳明晰で難問も簡単に解く。
He is sharp-minded and solves difficult problems easily.
優れた頭脳を持つ彼は天才と呼ばれる。
He is called a genius for his excellent mind.
頭脳労働と肉体労働の両方が必要だ。
Both mental and physical labor are necessary.