You bring iron ore from one part of the planet, carbon, limestone, you put it into this reactor and you ship this all over the world.

你得到钢铁从地球的一个地方，还有碳，石灰岩，将它们放入这个反应器,你将它运送到世界各地。

麻省理工公开课 - 固态化学导论课程节选

They'd like to be able to refer to each carbon separately so they can talk about reactions with this molecule, so they number the carbons.

为了在探讨这种大分子的,化学反应时能清楚地,表示每一个碳原子,人们对碳原子进行了编号

耶鲁公开课 - 生物医学工程探索课程节选