They find several critters that can survive only in clean water, and conclude that the pond is in good shape.
他们找到了一些只有在净水中才能存活的生物，因此确定这个池塘状态还不错。
Finnish engineers have poured pig manure into a contaminated pond next to an old mine, saying the bacteria in the slurry will clean up metals in the water.
为了治理一个被附近旧矿井所污染的池塘，芬兰工程师日前向池水中倾注了大量的猪粪浆。这样做是因为猪粪浆中包含的细菌能将池水中的金属物质清理干净。
The water in this pond is clean.
这个池塘的水是干净的。
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