Usually we write in journals, but I allow them to their writing in this book.

通常做法是写日志，但是我让他们在这个本子上写作。

麻省理工公开课 - 媒体、教育、市场课程节选

It's important for you guys to know that everything you write down in the notebook or blackboard as a symbol is actually a measured quantity.

其重要性就在于,你们要知道,你们记在本子上或者写在黑板上的任何物理符号,实际上都是测量量

耶鲁公开课 - 基础物理课程节选