trailer
/ˈtreɪlə(r); `trelɚ/ n
1
(a) truck or other wheeled container pulled by another vehicle 拖车; 挂车
They packed the food and camping equipment in the trailer. 他们把食物和野营用具都装上拖车上了.
(b) (esp US) = caravan.
2 series of short extracts from a film or TV programme, shown in advance to advertise it （电影或电视节目的）预告片.