已经变黄了用英语怎么说

"Yellowed" 表示变黄了。来源是因为变黄通常都是黄色的，所以用"yellowed"来形容。

例句：

The pages of this book have yellowed with age. (这本书的页面因为年龄增长而变黄了。)
His teeth have yellowed from smoking. (他的牙齿因为吸烟而变黄了。)
The once white walls have yellowed over time. (曾经白色的墙壁随着时间的推移已经变黄了。)