So a lot of teaching and learning can be thought as less synchronic activities and more diachronic one.

所以很多教学可以被看成是,不限于一时的而有历时变化的。

麻省理工公开课 - 媒体、教育、市场课程节选

bug And maybe by understanding why it worked on a and not on b, you'll get a lot of insight that you won't if you just focus on the bug.

发现很多东西，而你只关注,本身的话就发现不了这么多东西,如果知道你的程序至少还对。

麻省理工公开课 - 计算机科学及编程导论课程节选