biological clock

noun

/ˌbaɪəˌlɒdʒɪkl ˈklɒk/

/ˌbaɪəˌlɑːdʒɪkl ˈklɑːk/

(specialist)

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a natural system in living things that controls regular physical activities such as sleeping生物钟；生理钟
- (figurative) At 35, Kate's biological clock was ticking (= she was beginning to think that she would soon be too old to have children).到 35 岁时，凯特的生物钟开始滴答作响（开始觉得很快就会年龄大得不宜生育了）。
- The movements of the leaves are triggered by the plant’s biological clock.叶子的运动是由植物的生物钟触发的。
- With jet lag, your biological clock is out of synch with the actual time.因为时差的缘故，你的生物钟与实际时间不同步了。