广播电视英语短句 第 340 课：改良土壤-1

Compost is a dark, rich material added to soil to improve it. 混合肥是一种能够改良土壤的黑乎乎的肥沃物质。

Compost is produced when bacteria and fungi break down organic matter, aided by insects, earthworms and other organisms. 它是在昆虫、蚯蚓和其它有机物的协助下由细菌和真菌对有机物质的充分分解而成的。

This natural recycling returns nutrients to the soil. 这天然的再循环把营养还田。

Some experts advise adding five centimeters of compost for every fifteen centimeters of turned soil. 一些专家建议深翻十五厘米时，应追加五厘米厚的混合肥。

More and more people are making their own compost at home. 越来越多的人在家中自行加工混合肥。