We have seen cases where we have been gone five and ten years and we go back and they have developed roads and built schools, and they have other communities receiving the animals and the training.

VOA: special.2010.06.22

Built bridges and roads and automobiles, so we can get from one place to another relatively quickly because of that.

桥梁和道路的修建以及汽车的出现,使我们能够快速地,从一个地方到另一个地方

耶鲁公开课 - 生物医学工程探索课程节选