國家那扇門
同一扇門,把房間換成國家。邊界就是門,開著代表人、貨物和資金都可以比較自由地進來。這是概念上的延伸,不是另一條歷史來源。
noun · B2
A government's approach of letting people, goods and money come into the country freely — covering immigration, visitors, trade and investment from abroad, with few limits or taxes.
門戶開放政策