Sea Frontier

Sea Frontiers were established by the United States Navy from 1 July 1941 during World War II as areas of defense against enemy vessels, especially submarines, along the American coasts. Sea Frontiers generally started at the shore of the United States and extended outwards into the sea for a nominal distance of two hundred miles.

单词	Sea Frontier
释义	Sea Frontier 原声例句 VOA Daily Standard 2022年7月合集 The plan comes as Greece faces a sudden surge in refugees, both along its land and sea frontiers, as relations with its age-old foe deteriorate. 该计划出台之际，希腊正面临着与宿敌关系恶化、陆上和海上边境难民突然激增的局面。英语百科 Sea Frontier Sea Frontiers were established by the United States Navy from 1 July 1941 during World War II as areas of defense against enemy vessels, especially submarines, along the American coasts. Sea Frontiers generally started at the shore of the United States and extended outwards into the sea for a nominal distance of two hundred miles.
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