trunk highways的用法和樣例：
例句
- Many cities show a radial pattern of main highways.
許多城市的干線公路都呈放射狀模式。 - Properly arrange the construction of main highways which connect west China and middle part of China so as to give full play to the transportation system in western China.
要同步安排好與西部地區連通的中部地區干線公路的建設，保證西部運輸通道系統能力的發揮。
