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| 元古代界的; 原生代的; 元古宙 | |||
| era 元古代 | |||
| 元古代 | |||
| 元古代的; 元古〔代〕; 元古界 | |||
| 元古代的; 元古界的; 原生代 (的) | |||
| 元古界代的; 元古界【代】 | |||
| 原生代 (Pt) | |||
| 原生代 (era); 元古代 (era); 阿尔冈纪 (era) | |||
| English thesaurus | |||
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| Pt (MichaelBurov) | |||
| Protero | |||
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Proterozoic : 19 phrases in 6 subjects |
| Desert science | 1 |
| Earth sciences | 4 |
| Engineering geology | 1 |
| Geology | 1 |
| Oil / petroleum | 3 |
| Technology | 9 |
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