基本解释钙结砾岩,钙质壳同根派生 英汉例句Formed from calcicrete, an advanced concrete mixture, these wall sections serve to both block enemy movement and provide minor cover from direct fire. 由钙质壳构成;是一种高级的混凝土混合物;这种围墙不仅可以阻碍敌军前进;并且可以轻微的防护直射火力.