It's a long sequence of instructions, it starts at the beginning, walks through, may jump around a little bit, but eventually comes down at the end. It's okay for the things you're doing for the early problem sets.

这是一长串指令，从开端开始，向前步行，偶尔来回跳一会儿,但是最终会走到结尾,这些足以解决最初级的问题。

麻省理工公开课 - 计算机科学及编程导论课程节选

If it doesn't work, change it and just keep revising it, eventually something good comes out of it.

如果行不通就换一个主题，一直修改下去，直到写出好的作品。

写作课程比较难 - SpeakingMax英语口语达人