We should control the secondary pollution. 我們應該控制二次污染。
No wastewater release in manufacture procedure, remaining and soil assimilate after degradation, no second pollution formed. 產(chǎn)品在生產(chǎn)過(guò)程中,無(wú)污水排出,降解后,殘余物質(zhì)與土壤同化,不會(huì )形成二次污染。