这种化学污染有两个来源：直接把污水倒进河里的工厂，和把未经处理的人类垃圾倒进河里的本地社区。
This chemical pollution has two sources: the factories which dump polluted water directly into the river and the local community which dumps untreated human wastes into the river.
大约10000-12000年前，原始犬类远居于人类居住地，清除残羹、粪便和其他的人类垃圾。
Proto-dogs scavenged around the outskirts of human settlements about 10, 000 to 12, 000 years ago, removing food scraps, feces, and other human waste.
研究者最近打算调查一下那些自然食物资源丰富的小昆虫是否会喜欢人类垃圾食品。敬请期待吧！
The researchers now plan to test if the tiny insects show a preference for human junk food even when their normal diet is readily available - so stay tuned!
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