There are at least two varieties of imagination in the reader's case, so let us see which of the two is the right one to use in reading a book.

读者至少有两种不同的想象方式,所以让我们来看看,哪一种,适合读书。

耶鲁公开课 - 1945年后的美国小说课程节选

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