Last year for the pieces that do vary year to year a bit, last year's first problem set challenged students to write their first or maybe second or third program using this environment called Scratch.

去年的教材有些地方有略微改动，去年的第一个问题集是让学生,在Scratch环境下,写下自己的第一或第二个或第三个程序。

哈佛公开课 - 计算机科学课程节选

which is required of all second year Columbia University students.

是哥伦比亚大学所有大二学生的必修课。

有趣的课程 - SpeakingMax英语口语达人