支柱

pillar;mainstay;prop
欧盟的三大～是欧洲共同体、共同外交和安全政策、司法和内政合作。The European Union’s three pillars are the European Community,Common Foreign and Security Policy and Cooperation in Justice and Home Affairs./中国把加强同欧洲的友好合作关系作为自己对外政策的一个重要～。To strengthen friendly relations and cooperation with Europe is a pillar of China’s foreign policy./战略力量的～mainstay of strategic forces/精神～spiritual(or ideological)prop/～产业pillar industry;cornerstone industry