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| sea channel | |||
| trench | |||
| ocean trough | |||
| trough | |||
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| trough; troughs | |||
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海槽 : 106 phrases in 13 subjects |
| Air defense | 1 |
| Desert science | 1 |
| Earth sciences | 8 |
| Ecology | 1 |
| General | 3 |
| Hydroelectric power stations | 2 |
| Ichthyology | 1 |
| Latin | 1 |
| Navigation | 3 |
| Oil / petroleum | 16 |
| Reproductive biology | 1 |
| Surgery | 1 |
| Technology | 67 |
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