If you haven't got a sheet in front of you, just write it on your notepad.

如果你们没有拿到我发的纸,就写在你们的笔记本上

耶鲁公开课 - 博弈论课程节选

Why don't you write down a second on the corner of your notepad what it is you're going to choose to do with my T.A.'s watching so we can't cheat.

请你们各自在笔记本上写下你们的选择,让助教监督一下,以防你们沟通好了

耶鲁公开课 - 博弈论课程节选