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.