On 267, this is in one of these parenthetical passages where the narrator is commenting on what he's just given account of in his experience.

67页，这是一段插叙,叙事者在评论,他诉说过的经历。

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But in general, the choice of variable name is a great way of commenting your code.

但是通常来说，变量名称的选择,是评论你的代码的,一个重要方式。

麻省理工公开课 - 计算机科学及编程导论课程节选