last major defensive position
definitions
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The final significant fortification, strategic location, or arrangement of troops used to protect a territory or a specific area from an advancing enemy.ja: 最後の主要な防御陣地
examples
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Chentang Pass stood as the last major defensive position before the Shang capital.
陳塘関は商の都の前の最後の主要な防御陣地として立ちはだかった。