留美老師帶你每日說英文 第464期:動物糞便的奇異功能
臺灣籍旅美老師今天交給我們的句子是：
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!)
對於栽培農作物的農夫來說，排泄物是非常重要的。但是排泄物不只可以用來施肥。根據研究顯示，每年有數百萬噸的糞便排入非洲的水生態系統。部分研究人員認爲高濃度的排泄物會導致魚羣死亡，但最新的研究顯示糞便對魚是有益的！
