trailer dolly的用法和樣例：
例句
- This paper introduces the control system design of the medical oxygen generator in the field trailer.
介紹了野戰制氧挂車醫用制氧設備控制系統的設計。 - 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.
野營挂車一種帶有空間和裝備動力交通工具，裝在後部的空室或是裝在相連的拖挂車內，提供睡眠和做簡單的家務，用於野營和消閑的旅行。
