发黄

tā zuò zhe liú lǎn fā huáng de shū yè

她坐着浏览发黄的书页。

She sat scanning the yellowing pages.

hěn duō rén rèn wéi fā huáng shòu cháo shì yóu piào zuì dà de dí rén

很多人认为，发黄、受潮是邮票最大的敌人。

Many people believe that yellowing and wetness are the greatest enemy of stamps.