biological clock

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英

权威英汉双解

biological clock

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1.	生物钟；生理钟a natural system in living things that controls regular physical activities such as sleeping

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）。