whiten
verb [ I or T ] uk/ˈwaɪ.tən/ us/ˈwaɪ.t̬ən/
（使）变白
to make or become whiter
She had her nicotine-stained teeth whitened. 她将她那被尼古丁熏黑的牙齿漂白了。
Her hair had whitened over the years. 这么多年来她的头发已经变白了。
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