“这是一种试验，看它是否能成为一个可行的商业模式，因为他不想现在就靠它挣任何钱，”她说。

"This is sort of a pilot to see if it can become a viable business model because he isn't going to make any money from this," she said.

youdao

果然，这只狮子听它的话大吼一声以后，那个农夫就靠过来看，现在天亮了，一看是只狮子，哇！

The lion accepted his advice and roared loudly, so the farmer took a closer look.

youdao

对了，他的CEO是个南非人，曾经在Sorbonne接受教育，现在生活在密苏里和加利福尼亚。 他就靠一部黑莓手机指挥公司的运营。

Oh, and the C.E.O. is a South African, who was educated at the Sorbonne, but lives in Missouri and California, and his head office is basically a BlackBerry.

youdao

That is the whole triumph of calculus is to know that by looking at the position now, the position slightly later and taking the ratio and bringing later as close as possible to right now, we define a quantity that we can say is the velocity at this instant.

这就得靠微积分了,通过了解它现在的位置,和一小段时间以后的位置,计算它们的比,再让时间间隔尽可能缩短,我们就定义了一个,被我们称之为瞬时速度的物理量

耶鲁公开课 - 基础物理课程节选