treat的同义词是什么

　　例句：

　　1. New ways to treat arthritis may provide an alternative to painkillers.

　　关节炎的'新疗法可能是止痛药之外的另一种选择。

　　2. They shouldn't treat their mother in this disrespectful way.

　　他们不能这样无礼地对待亲生母亲。

　　3. Her cousin, a hairdresser, was perming her hair as a special treat.

　　她表兄是美发师，正在免费给她烫发。

　　4. No one knew how to treat this dreaded disease.

　　没人知道如何治疗这种可怕的疾病。