In my cell phone, I have an app that tells me where every plane in the world is, and its altitude, and its speed, and what kind of aircraft it is, and where it's going and where it's landing.
我的手机有一个程序， 能显示地球上每一架飞机的位置、航向、速度 飞机的型号， 目的地是哪里，将在哪里降落。