陈家刚：因为，换一种拍法是另外一种，我现在不拍记忆，我拍三线的今天。

Chen Jiagang: If I changed the method of shooting, there would be another genre of pictures. I don't shoot memory now, I shoot the today's existence of the third front.

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陈家刚：对，我小时候在重庆，重庆也有三线，我的很多亲戚、同学家里都是三线的。

Chen Jiagang: Yes. I was in Chongqing when I was young. They also have a third line there. A lot of my relatives and classmates' families were all in the third line.

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有着超过10年的在一线、二线及三线的IT支持经历，Jon Tydda现在为英国的制药研发提供专业知识。

With more than a decade of experience in first -, second -, and third-line it support, Jon Tydda now provides his expertise to pharmaceutical research and development in the United Kingdom.

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sigma That is one pi orbital. There is one sigma, one pi and there is a second pi, and that is how we are getting the triple bond.

那是一个pi轨道，有一个，一个pi，还有第二个pi轨道，这就是我们如何得到三线态的。

麻省理工公开课 - 固态化学导论课程节选