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。