从技术上讲，我可以挖一些汞，铅，砷和其他有毒物质从土壤，东西成豆腐配方，并将其出售的“100 %天然”的产品。
Technically speaking, I could dig up some mercury, lead, arsenic and other toxic substances from the soil, stuff them into a tofu recipe, and sell it as a "100% natural" product.
砷和铅也是天然形成的金属元素，在工业上从制造杀虫剂到应用于电子工业，它们有着多种用途。
Arsenic and lead are also naturally occurring metallic elements that have varieties of USES in industry from insecticides to electronics.
他们鉴定出四种不同的含铅物质，其中两种是人工合成的，并非天然物质。
They identified four different lead-based substances, two of which were man-made, not natural.
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