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

"Some of these inventors have been designers of the human genome sequencer, incredible technologies around focusing sound in the same way have been able to focus light with lasers, health technologies like the stair-climbing wheelchair and a portable dialysis machine,".

VOA: standard.2009.12.18