-  旅行拖车;大篷车;房车
 A caravan is a vehicle without an engine that can be pulled by a car or van. It contains beds and cooking equipment so that people can live or spend their holidays in it.
 
in AM, usually use 美国英语通常用 trailer
										- N-COUNT (带着牲口的一群人结伴而行的)旅行队;车队
 A caravan is a group of people and animals or vehicles who travel together.- ...the old caravan routes from Central Asia to China.
 从中亚到中国的古老的旅行线路