单词：ditch irrigation
ditch irrigation的用法和样例：
例句
- Principles outlined for furrow irrigation apply to related methods of irrigation.简述的沟灌原理也适用于相近的灌水方法。
- Extensive land leveling is often required because the topography must be smoother than for furrow irrigation.由于畦灌的地形必须比沟灌的平坦，因此，常常需要大面积平整土地。
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