outworks
n．外围防御工事：位于城堡、要塞或城市防御工事主体之外的辅助防御设施，如壁垒、堑壕等。
例句
Peter set up a forward camp with hastily constructed timber walls and outworks, or redoubts, extending into the plain.
彼得则匆忙建起延伸至平原的木墙、外堡或者角面堡，并以此为前进营地。
