Bill Hunt,a professor of Biology and Agricultural Engineering at North Carolina State University, has developed an easy-to-use computer model to predict how landscape impacts water pollution.

VOA: standard.2010.08.04

And there's two you could use to attack through, easy or hard.

同样他也有两条路入侵途径,平坦之途和崎岖之途

耶鲁公开课 - 博弈论课程节选

He says an cheap and easy-to-use medicine for sleeping sickness is badly needed.

VOA: standard.2010.04.05