translation.en: And the camera basically tracks these four fingers and recognizes any gestures that he's making so he can just go to, for example, a map of Long Beach, zoom in and out, etc.
translation.zh: 摄像头会跟踪这四个手指， 识别他的任何手势， 例如，他可以打开Long Beach的地图， 进行放大或者缩小等等操作。