广播电视英语短句 第 320 课：肥料使用-4

Farmers lack enough inputs to maintain soil fertility is parts of many developing countries, especially in Africa south of the Sahara. 在许多发展中国家的部分地区，尤其是撒哈拉以南非洲，农民缺少足够的投入来保持土壤肥力。

But countries that are developed or growing quickly often have unnecessary surpluses. 但是发达国家或发展迅速的国家则产生了不必要的过剩。

Ammonia gas released by fertilized cropland is a cause of air pollution. 由使用化肥的农田释放出的氨气是空气污染的一个原因。

The land can also release nitrous oxide, a heat-trapping gas.
农田还会释放使空气温度升高的一氧化二氮。

Nitrogen runoffs from farms can create large dead zones, like those in the Gulf of Mexico. 从农田流失的氮素会产生大面积的死亡区域，比如墨西哥湾。