biological clock
noun /ˌbaɪəˌlɒdʒɪkl ˈklɒk/
/ˌbaɪəˌlɑːdʒɪkl ˈklɑːk/
(specialist)- 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。
- (figurative) At 35, Kate's biological clock was ticking (= she was beginning to think that she would soon be too old to have children).