The Palestinians say there must be some progress on the settlement issue before any meeting takes place.

VOA: standard.2009.09.13

That is to say, if something causes literature, there must be some sort of authority behind it and therefore we find ourselves asking, "What is an author?"

即是说，如果文学有缘由的，它的背后一定存在作者,所以我们会问，“作者是谁？“

耶鲁公开课 - 文学理论导论课程节选

And that the fact that it split into two was telling them that there must be some new property to the electron, and what we call that now is either being spin up or spin down.

它能一分为二的,事实告诉我们,电子一定有某种新的性质，我们叫它自旋向上或者自旋向下。

麻省理工公开课 - 化学原理课程节选

There must be fundamental reasons for it and I wanted to go over some of the fundamental reasons why we have banks.

它的形成必有其根本的原因,下面我就阐述银行产生的一些基本原因,为什么会有银行

耶鲁公开课 - 金融市场课程节选

And what they could come up with, what they reasoned, is that there must be some intrinsic property within the electron, because we know that this describes the complete energy of the orbital should give us one single frequency.

他们想到着一定和，电子的本征性质有关，因为我们知道这个轨道的,完整描述会给出单一的频率。

麻省理工公开课 - 化学原理课程节选