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| river A stream of water which flows in a channel from high ground to low ground and ultimately to a lake or the sea, except in a desert area where it may dwindle away to nothing. A river and all its tributaries within a single basin is termed a drainage system | |||
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abhainn : 4 短语, 4 学科 |
| 环境 | 1 |
| 生命科学 | 1 |
| 自然资源和野生动物保护 | 1 |
| 运输 | 1 |