My colleagues and I are studying something called augmented reality (a field of computer research dealing with the combination of real-world and virtual reality)," said Christopher Dede, professor in learning technologies at Harvard University, "Alien Contact," for example, is an exercise developed for middle-school students who use hand-held devices that can determine their location.
出自-2013年6月阅读原文
Chaos theory was developed by scientists, trying to explain the movement of the planets and the changes in environmental conditions
出自-2013年6月听力原文
Overall between 30% and 50% of what has been bought in developed countries is thrown away by the purchaser.
出自-2013年12月阅读原文