Remember that these cells are relatively large compared to bacteria and so diffusion doesn't occur very quickly over this length scale.

要知道这些细胞相对细菌而言,还是比较大的,扩散作用在这种尺度上,发生得不是那么快

耶鲁公开课 - 生物医学工程探索课程节选

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