noun · A military fortification or stronghold established in enemy territory to facilitate further advancement.

部队在渡河后迅速建立了桥头堡。

noun · An ornamental or functional structure located at either end of a bridge.

南京长江大桥的桥头堡是该建筑的标志性特征。

noun · A strategic location serving as a base for economic or cultural expansion into other regions.

该城市被定位为连接东南亚市场的桥头堡。