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| 冰河时代; 冰河期 | |||
| 冰川期 | |||
| 冰期 | |||
| 冰河期; 冰川时期; 冰川纪 | |||
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| 冰期 | |||
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glacial period : 9 phrases in 4 subjects |
| Agriculture | 1 |
| Desert science | 3 |
| Oil / petroleum | 3 |
| Technology | 2 |
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