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| 天然排泄; 自然排水 | |||
| 天然流量; 天然排泄量 | |||
| 自然流量; 天然流量自然流量 | |||
| 日常流量 | |||
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natural discharge : 3 phrases in 2 subjects |
| Engineering geology | 1 |
| Technology | 2 |
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