Or they incorrectly use articles such as "a", "an" and "the."

VOA: special.2009.04.30

But then, they would also need to buy into an entire service army of people to figure out how to use it.

但之后他们也需要买入整个,服务团队的人来研究怎么用它。

斯坦福公开课 - Twitter之父Jack.Dorsey演讲：好奇和灵感的力量课程节选

He's been directing his project for actually several years, which is an attempt to give students to a much wider range of materials that they can use to help learn about Shakespeare and his work.

他已经指导这个项目,好几年了，试图给学生机会,接触更多更广的关于莎士比亚,及其作品的资料，来帮助学习。

麻省理工公开课 - 媒体、教育、市场课程节选

Let me use Darfur as an example. In south Darfur right now, they are only cultivating about a third of the arable land that they could be cultivating.

VOA: standard.2009.10.14

Convention, OK, this negative sign is just a pure convention. You just got to use it all the time. If you use an old textbook, written when I was taking thermodynamics, they have the opposite convention, and it's very confusing. But now we've all agreed on this convention, and work is going to be with the negative sign here.

系统对外界做功的符号为负,这就是我们,在本课中的规定，纯粹出于统一符号的需要，有些教科书中，可能会使用相反的符号规定,注意不要混淆了，这门课上,我们将一直使用。

麻省理工公开课 - 热力学与动力学课程节选