Six weeks after the baby's birth, a mother,who is enrolled in the treatment program, has to bring her baby to the clinic for injections against childhood illnesses, such as measles and polio.

VOA: standard.2010.07.01

> David: Welcome back to CS50, and welcome now that you are officially enrolled.

>，大卫：欢迎回到CS50课程,也欢迎你们正式登记加入我们。

哈佛公开课 - 计算机科学课程节选

> David: Welcome back to CS50, and welcome now that you are officially enrolled.

>，大卫：欢迎回到CS50课程,也欢迎你们正式登记加入我们。

哈佛公开课 - 计算机科学课程节选