And he says this about his own little research: "I shall not hesitate to put down for you with my interpretations whatsoever things I well learned at one time from the Presbyters," just meaning the old guys,elders,"and well remembered, confidently asserting truthfulness for them.

对于他自己的研究，他这样说：,“我会毫不犹豫地写下,我曾经从长老那里学到和记住的,一切东西，而且加上我的诠释“,长老指长者，前辈，“并自信地肯定他们的真实性。

耶鲁公开课 - 新约课程节选

So, the point is whenever you have derivatives with something over dt, do not hesitate to cancel the dts This will be actually true as long as both quantities are vanishingly small.

关键在于,只要你推出的式子分母上有dt,不要犹豫,直接约掉,这个式子只在,两遍都是无穷小的情况下成立

耶鲁公开课 - 基础物理课程节选