And third is that physical things are readable on a map -- so restaurants, a variety of venues, but also with GPS and other technology like RFID and it continues to expand beyond that, we can also track things that are moving, like a car, a taxicab, a transit system, a box that's moving through time and space.
第三，你既能在地图上 找到实物 比如餐厅，还有其它场所 而且能用GPS和其它科技 比如无线射频识别技术进行定位 而且新技术还在层出不穷 我们能追踪移动中的物体 如汽车、出租车、运输系统 不受时空限制