furrow 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。 - 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。
