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| 洋中脊; 中脊及中央海岭 | |||
| 中央海岭; 中央海脊; 大洋中央海岭 | |||
| 大洋中脊 | |||
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mid-oceanic ridge : 7 phrases in 4 subjects |
| Desert science | 1 |
| Geology | 1 |
| Oil / petroleum | 3 |
| Technology | 2 |
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