常見例句用作名詞 (n.)Beware of the fifth column. They often infiltrate into key positions and seek to undermine the body politic from within.要提防隱蔽的敵人，他們經(jīng)常滲透到關(guān)鍵崗位企圖從內(nèi)部破壞國家政躰。 返回 fifth columnism