| 单词 | lifetime |
| 释义 | Word Frequency lifetime(ˈlaɪfˌtaɪm) noun 1. a. the length of time a person or animal is alive b. (as modifier) a lifetime supply 2. the length of time that something functions, is useful, etc 3. physics the average time of existence of an unstable or reactive entity, such as a nucleus, excited state, elementary particle, etc; mean life |
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