Aristotle, in his Politics of course, tells us the most on this subject and often he is our source of information.

亚里士多德,在他的《政治学》中,告诉我们很多有关这个主题的知识,他经常也是我们信息的来源

耶鲁公开课 - 古希腊历史简介课程节选

We do know, again, Thucydides is our source, that it was customary for colonies to send representatives back to the mother city for the religious observations that were common to them all, so that those create good feelings.

修昔底德的著作里提到,殖民地派遣代表回母邦,参与宗教仪式是他们的习俗,所以这使彼此间有了好感

耶鲁公开课 - 古希腊历史简介课程节选

So we needed to come up with another source, a renewable source, so we turned our attention to embryonic stem cells.

因此，我们需要一种替代材料，一种可以再生的材料，我们注意到了胚胎干细胞胚胎干细胞。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Intensity, if we increase the intensity, we're not increasing the energy in each photon, we're just increasing the number of photons that we're shooting out of our laser, whatever our light source is.

强度，如果我们增加强度，我们增加的不是,每个光子的能量，我们增加的仅仅是,从我们激光源射出的光子数，无论我们的光源是什么。

麻省理工公开课 - 化学原理课程节选

There is in Frost no God, no transcendental source of guidance or consolation, nothing out there in the world but the material conditions of our circumstances.

在弗罗斯特的诗里，没有上帝，没有卓越的指引和安慰，这个世界里什么都没有,除了我们生活环境的物质条件。

耶鲁公开课 - 现代诗歌课程节选