例句 |
noun (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. |