Ice dancers Scott Moir and Tessa Virtue provided a welcome relief when they won gold in the figure skating this week.

VOA: standard.2010.02.23

Alright, welcome back to CS50, this is the start of week 4.

欢迎来到CS50学堂，这是第四周的课程。

哈佛公开课 - 计算机科学课程节选