And in fact, the researchers tested library noise too, like the sounds of typing and rustling papers.

事实上，研究人员还对图书馆噪音、打字声以及纸张的沙沙声进行了测试。

It wasn't long before he needed to earn some money to buy typing paper and other supplies.

不久之后，他就需要赚一些钱来购买打字纸和其他用品。