Kēxuéjiā zhèngzài yánjiū rén nǎo de gōngzuò jīzhì.
Scientists are studying how the human brain works.
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人脑 specifically means the biological human brain, as opposed to 电脑 (diànnǎo, computer — lit. 'electric brain'). The parallel construction highlights a clever Chinese calque: both 人 (human) and 电 (electric) modify 脑 (brain).
