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| 等深线 | |||
| 河底等高线 | |||
| 莫霍面深度; 等水深线; 等海深线 | |||
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| 等深线 | |||
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depth contour : 12 phrases in 4 subjects |
| Bridge construction | 1 |
| Hydroelectric power stations | 4 |
| Technology | 6 |
| United Nations | 1 |
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