southwestern frontier的用法和樣例：
例句
- Some trading posts exist in the Southwestern US,where Indians sell or exchange products for food,clothing,and farm equipment.
美國西南地區還有些商棧，在那里印第安人出售產(chǎn)品或以產(chǎn)品交換食品，衣物及農用設備。 - I set up sales companies in Shanghai and logistics hubs, in the southwestern region of Guizhou and Sichuan has three processing factories.
我公司在上海設立銷(xiāo)售及物流中轉中心，在西南地區的貴州與四川設有三家加工工廠(chǎng)。
