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| NOUN usually singular |
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| /ˈlaɪfˌtaɪm/ |
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| 1 | the period of time when someone is alive 一生；终生 |
| He achieved a lot in his short lifetime. 他在短短的一生中取得了许多成就。 |
| There have been many changes during my lifetime. 我一生经历了许多变革。 |
| A cure for cancer could be found within our children’ s lifetime. 我们孩子那一代可能会找到治疗癌症的方法。 |
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| 2 | the length of time that something exists or works 存在期；有效期；使用期 |
| plans to extend the lifetime of the power station 延长发电站寿命的计划 |
| We aim to halve unemployment within the lifetime of this government. 我们打算在本届政府任期内把失业率减低一半。 |
| PHRASES |
| - | the holiday/experience/chance etc of a lifetime
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| the best holidayexperiencechance etc that you will ever have |
| 百年难遇的假日/终生难得的经历/千载难逢的机会等 |
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| - | once in a lifetime
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| a once in a lifetime experience is very unusual or special |
| （经历）极不寻常的，很特别的 |
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