Only 4% of the continent's farmland is irrigated.

整个非洲大陆上只有4%的土地得到灌溉。

If the eye is affected, it should be irrigated thoroughly.

如果眼睛受影响，应该进行彻底冲洗。

Only 17% of all the world's agricultural land is irrigated.

全世界农耕地只有17%得到灌溉。

The Mekong River provides fertile, irrigated fields for rice production.

湄公河为水稻种植生产提供了肥沃的可灌溉土地。

The reason water matters so much is that irrigated farming is so productive.

水之所以这么重要的原因是，灌溉的田地产量高。 虽然只占世界总耕地的五分之一，但是生产了世界粮食的五分之四。