People do draw other forces.

真的有人乱画其它力

耶鲁公开课 - 基础物理课程节选

And if I did this, and again, don't scribble too much in your notes but if we just make it clear what's going on here, I'm actually going to delete these strategies since they're never going to be played I end up with a little box again.

如果我再进行一次,别在笔记上乱画,我们只是想知道最后会怎样,因为这些策略不会被人采用,所以我剔除掉它们,最后我得到了一个更小的方格

耶鲁公开课 - 博弈论课程节选