In fact, I'm going to use only two dimensions for most of the time because the difference between one dimension and two is very great.

实际上,大多数时候我只考虑二维的情况,因为一维和二维的差别很大

耶鲁公开课 - 基础物理课程节选

He splits his time between the two, these two great institutions.

他同时在这两个，伟大的学府任职。

普林斯顿公开课 - 人性课程节选