台湾籍旅美老师今天交给我们的句子是：
And farmers know the importance of waste in raising their crops, but feces aren't just for fertilizing. According to some research, millions of tons of dung enters Africa's aquatic ecosystems every year. Some researchers think high concentrations of excrement leads to fish die offs. (But new research suggests it might be good for the fish!)
对于栽培农作物的农夫来说，排泄物是非常重要的。但是排泄物不只可以用来施肥。根据研究显示，每年有数百万吨的粪便排入非洲的水生态系统。部分研究人员认为高浓度的排泄物会导致鱼群死亡，但最新的研究显示粪便对鱼是有益的！
