Industrial waste is even more harmful since there are many highly poisonous materials in it, such as copper and lead.
工业废料更有害,因为其中有许多毒性很强的材料,如铜和铅。
2
He layered pieces of glass and used thin copper strips instead of lead, which let him make these really intricate flowery designs for stained glass, which he used in lampshades.
他把玻璃分层,用薄铜片代替铅,这让他对彩色玻璃做了这些非常复杂的华丽设计,用在灯罩上。
3
Massive ore deposits of copper, lead, zinc, silver, gold and other metals formed in this way.