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| 21. | Laurentian Trough |
| 劳伦琴海槽 |
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| 22. | trough earthquake |
| 海沟地震 |
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| 23. | resonance trough |
| 共振槽 |
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| 24. | geosynclinal trough |
| 地槽式槽地 |
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| 25. | synthetic trough |
| 合成糟 |
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| 26. | pneumatic trough |
| 集气槽 |
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| 27. | pressure trough |
| 气压槽 |
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| 28. | depression trough |
| 衰落波谷 |
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| 29. | potential trough |
| 势阱|位阱 |
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| 30. | coating trough |
| 刮胶斗 |
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