At most American colleges, undergraduate students choose one area of study, like English or biology, and focus on it for all four years of their education.

VOA: standard.2010.05.12

In particular, we're going to focus today on sort of how to manipulate and use DNA in some applications, and this is a huge area of science and technology.

特别是,我们今天要重点讲,如何操作DNA并应用它们,这是一个十分广阔的科学技术领域

耶鲁公开课 - 生物医学工程探索课程节选

He says efforts to make progress in that area, include adding a member of the U.S.Treasury Department to his staff to focus exclusively on the source of Taliban funding.

VOA: standard.2009.06.15

It's just we've lost our focus. And so there is a need to be refocusing on the area of science, making it accessible to a wider rage and a more diverse group of students, not just young men, but also young women."

VOA: standard.2009.11.25