他是医院烧伤科的负责外科医生。

He’s the surgeon in charge of the burn ___unit at the hospital.

我兄弟的假期结束了，所以他明天必须回到他的空军单位。

My brother's leave is over so he has to report back to his air force ___unit tomorrow.

这非常重要，因为一旦他们长大，他们就需要与自己的孩子组成家庭单位。

This is very important because once they have grown up, they have to be together in the family ___unit with their own kids.