tz

例句：

1. 1. She is a teacher who teaches English as a second language.
   她是一名教授英语作为第二语言的老师。
2. 2. He is a doctor who specializes in cardiology.
   他是一名专攻心脏病学的医生。
3. 3. She is a nurse who works at the hospital.
   她是一名在医院工作的护士。