When a customer arrives at a supermarket checkout, an overhead camera identifies the items on the conveyor belt and anything left behind in the shopping trolley.
当顾客在超市收银台结账时，头顶的摄像机能识别放在传送带上的商品和任何遗忘在购物车里的商品。
2
What if the trolley can be stopped by dropping a large weight in its path from a bridge overhead?
如果这个电车可以通过从头顶的桥上扔一个大重物来停下呢？
3
This paper describes general structure design and structure load test of girder type railway bridge erecting machine with single simple supported beam and overhead transversely travelling trolley.