trailer dolly的用法和样例：
例句
- This paper introduces the control system design of the medical oxygen generator in the field trailer.
介绍了野战制氧挂车医用制氧设备控制系统的设计。 - A motor vehicle with space and equipment,either in a rear compartment or in an attached trailer,for sleeping and simple housekeeping,used for camping and recreational travel.
野营挂车一种带有空间和装备动力交通工具，装在后部的空室或是装在相连的拖挂车内，提供睡眠和做简单的家务，用于野营和消闲的旅行。
