“变黄”怎么读？

已经是秋天了,树叶变黄了.It was autumn and the leaves were yellow.书页因年久而变黄.The leaves of the book were yellowed with age.秋天,树叶由绿变黄.In autumn the leaves change from green to yellow....

“变黄”的英语可以翻译为：[植] flavescence ...