I hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty of whom or which I have heretofore been a subject or citizen; that I will support and defend the Constitution and laws of the United States of America against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I will bear arms on behalf of the United States when required by the law; that I will perform noncombatant service in the Armed Forces of the United States when required by the law; that I will perform work of national importance under civilian direction when required by the law; and that I take this obligation freely without any mental reservation or purpose of evasion; so help me God.
我在这里郑重的宣誓：完全放弃我对以前所属任何外国亲王、君主、国家或主权之公民资格及忠诚，我将支持及护卫美利坚合众国宪法和法律，对抗国內和国外所有的敌人。我将真诚的效忠美国。当法律要求時，我愿为保卫美国拿起武器，当法律要求時，我会为美国做非战斗性之軍事服务，当法律要求時，我会在政府官员指挥下为国家做重要工作，我在此自由宣誓，绝无任何心智障碍、藉口或保留，請上帝帮我。
还有想说一下，踩这个美国公民誓言的，你有自由离开美国，好走不送。
有第三国绿卡怎么保留中美两国国籍？
出入走第三国，中美海关就看不出来了，估计是这意思