释义
n.
a connection between two land masses, especially a prehistoric one that allowed humans and animals to colonize new territory before being cut off by the sea, as across the Bering Strait and the English Channel
陆桥（连接两块大陆的地带，尤指史前时期的人和动物在被海洋隔断之前借以移居新土地的地带，如跨越白令海峡和英吉利海峡的陆桥）