具体描述
Trucks lift, dump, and carry things every day, everywhere. Did you know that... Some trucks can weigh as much as ten elephants put together. Flatbed trucks can carry other trucks, houses, and even a space shuttle! Semitrailer cabs can have a bed behind the front seat so that drivers can pull over and rest on long trips. Road-train trucks pull multiple trailers at the same time, just like a locomotive pulls freight cars on a train.
