Cows, goats, and sheep require symbiotic microbes to help digest the plant biomass that they eat, and some of these microbes make the methane.
奶牛，山羊，绵羊需要借助细菌微生物的帮助来消化他们食用的植物，而他们中的一些细菌便能产生甲烷。
3
In order to halt the expanding desert in Inner Mongolia, efforts need to made to plant more shrubs and to replace sheep and goats with dairy cattle to help increase the income of the nation.