再看看标签。那是炭黑跟树脂加热混合而形成的一张薄膜,请问,你知道怎么制造树脂吗,你知道炭黑是什么东西吗?

• Observe the labeling. That's a film formed by applying heat to carbon black mixed with resins. How do you make resins and what, pray, is carbon black?