DOTS,the Stop TB Strategy was launched in 1994.

VOA: standard.2009.12.09

And the idea is that when you do these Lewis dot structures, we're representing electrons with dots, which we'll see in a minute, and each dot is going to represent a valence electron.

而当你遇到这些路易斯点结构时，我们会将电子用点来表示，我们马上就会看到，每个点都代表了一个价电子。

麻省理工公开课 - 化学原理课程节选

These are all things that the Bawendi group is working on. What they are real experts in is synthesizing many different kinds of these dots, and they have a synthetic scheme that's used by research groups around the world.

这些是Bawendi组正,在做的工作，他们擅长的是,合成各种量子点，他们的,方法已经被世界各地的,实验组采用，他们组还和。

麻省理工公开课 - 化学原理课程节选