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| 奥陶纪系的 | |||
| 奥陶纪系 | |||
| 奥陶纪 (系) | |||
| 奥陶系/纪 | |||
| 奥陶〔纪，系〕 | |||
| 奥陶纪的; 奥陶系的; 奥陶系 | |||
| 奥陶系纪的; 奥陶纪系的 | |||
| 奥陶纪 | |||
| 奥陶纪 (period) | |||
| English thesaurus | |||
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| Ord | |||
| Ordovician: 39 phrases in 7 subjects |
| Agriculture | 1 |
| Desert science | 2 |
| Earth sciences | 7 |
| Geology | 8 |
| Hydroelectric power stations | 5 |
| Oil / petroleum | 1 |
| Technology | 15 |
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