借助于水的重力作用，通过设备从水源引水、向农田输水和配水进行的灌溉gravity irrigation

• 原来都是自流灌溉，现在用水泵抽水。

  Originally, it was all gravity irrigation; now pumps are used to draw water up.

• 该工程已实现对20多万亩水田的自流灌溉。

  This project has achieved the gravity irrigation of over 20,000.