body clock

biological mechanism that automatically controls various recurring functions of the human body, eg the need to sleep 生物钟（自动控制人体各种周期性节律的生物机制, 如睡眠的需要）: I only arrived in London yesterday and my body clock is still on New York time. 我昨天刚到伦敦, 而我的生物钟仍然是纽约时间.

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