1 (US 美 trailer) a large vehicle that is pulled by a car. You can sleep, cook, etc in a caravan when you are travelling or on holiday. 野营车（用汽车拖曳的大型车辆，饮食起居均在车内，用于旅行或度假）
When we are talking about using a caravan for holidays we say go caravanning. 在野营车度假叫做 go caravanning。
2 a group of people and animals that travel together, for example across a desert 沙漠旅行队