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| polder; polder A generally fertile tract of flat, low-lying land (as in Netherlands and Belgium) reclaimed and protected from the sea, a lake, a river, or other body of water by the use of embankments, dikes, dams, or levees. The term is usually reserved for coastal areas that are at or below sea level and that are constantly protected by an organized system of maintenance and defense | |||
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kogen : 35 短语, 12 学科 |
| 一般 | 5 |
| 专利 | 7 |
| 农业 | 7 |
| 化学 | 6 |
| 地球科学 | 1 |
| 机械工程 | 1 |
| 核物理 | 1 |
| 生命科学 | 2 |
| 能源行业 | 1 |
| 自然科学 | 1 |
| 财政 | 1 |
| 食品工业 | 2 |