natural barrier短语⁵⁴⁸⁴⁵ 基本例句 天然屏障 乡村农业 The navy is sail through to the peninsula of Greece, the ground force makes a detour in Thrace the first natural barrier pool and green valley of Greece are attacked northwards. 海军直航希腊半岛，陆军则绕道色雷斯向北希腊的第一天险潭碧谷进攻。206.108.53.28