Trolley case swept the world

The emergence of trolley case has brought great convenience to people's lives, the rapid development of material civilization of teachers and students. Trolley box edge to the English word: Luggage case, from the homonym "Luggage", the Chinese call is the lever. Roller trolley At the same time, the trolley also box set a rod, a single rod and double rod rod of the sub, the rod of the tube also has a tube and pipe points, to facilitate walking while towing, greatly reducing the burden.
Trolley can be hand-held can also be dragged, we usually use the trolley wheels are basically at the bottom of the box, and modern people have designed a new form of trolley case, the box design into a cylinder shape, the wheels are The whole outsourcing in the box outside, this drum design makes this suitcase can better adapt to different terrain, such as direct pull the box can easily up and down the stairs.