变黄
That paper has yellowed with age. 那张纸因年代久远而泛黄了。
The leaves turn yellow in autumn. 秋天时叶子变黄。
The presence of excess carotene in the blood, often resulting in yellowing of the skin. 胡萝卜血症血液中出现过量的胡萝卜素，经常引起肤色发黄
