| 释义 |
- n.极漫长的时间；千万年；宙（地质学上的年代分期，下分代）
- 网络永世；昂；万古
1. | 极漫长的时间；千万年an extremely long period of time; thousands of years |
2. | 宙（地质学上的年代分期，下分代）a major division of time, divided into eras |
| eons of geological history 数以亿万年计的地质史 |
n. | 1. a length of time that is too long to measure 2. a division of geologic time comprising two or more eras 3. an extremely long period of time |
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