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。