变黄

zhè zhǐ yīn nián dài jiǔ yuǎn ér biàn huáng le

这纸因年代久远而变黄了。

The paper was yellowed with age.

qiū tiān yǐ jīng shǐ quán bù de yè zi biàn huáng

秋天已经使全部的叶子变黄。

Autumn has yellowed all the leaves.