Because as you'll soon find, when you're writing programs 0 that aren't just four lines long but are 40 or 400 which very quickly becomes easy, you'll find that even you the next morning have no idea what this code does for whatever reason, and just having some English comments is a huge boon to comprehension for yourself and others.

你们自己写程序时就会发现,用40行甚至400行代码来代替繁杂拥挤的4行代码0,将会让事情简化许多，你会发现，即使由于某些原因,你不知道如何写代码，先写些注释，于人于己，都是好事,易于理解嘛。

哈佛公开课 - 计算机科学课程节选

If you're not taking notes in this lecture, you have to write down at least one sentence. You must write this down because this will be the most important thing I say all morning: Milton's Paradise Lost is the first narrative poem in English that didn't rhyme.

就算你们这堂课不记笔记，也一定要记下至少一句话，一定要把这记下来,这是我一早上说的最重要的一句话了：,弥尔顿的《失乐园》是,第一首不押韵的英语叙事诗。

耶鲁公开课 - 弥尔顿课程节选