例句與造句

1. But the previous research works mainly focused on the screening of environment persistent pollutants , such as organochlorine insecticides and alkylphenol , to our knowledge , no report on the residual toxicity and environmental estrogens effects has been existed in the literature yet
   但目前為止，主要集中于環(huán)境中持久性有機污染物如有機氯農(nóng)藥和烷基酚類化合物的篩選上，而我國是農(nóng)業(yè)大國，大量地使用了有機磷農(nóng)藥，其殘留毒性及環(huán)境雌激素效應(yīng)的研究還尚未見報道。
2. It's difficult to find persistent pollutant in a sentence. 用persistent pollutant造句挺難的