| 释义 |
| | | | NOUN | | | | | 1 | a system in the body that controls when certain regular activities happen , for example sleeping 生物钟 | | | | 2 | informal a woman’ s need to have children before she reaches a certain age and can no longer physically do so 受孕生理钟（指女性到了一定年龄后不能再生育） | She felt her biological clock ticking away. 她感到自己年龄太大，不能生育了。 | | | |