they have been used to remove arsenic from the sludge produced by gold mining operations
题目
they have been used to remove arsenic from the sludge produced by gold mining operations
翻译,produced
答案
翻译:
它们被用来去除沉积物里面采挖金矿产生的砷.
produced by gold mining operations 是个过去分词结构,作定语修饰arsenic.produce这里是导致、使出现的意思.
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