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In other words, when they become citizens of the United States, they can no longer be a citizen of another country.
换句话说，当他们成为美国公民时，他们就不再是其他国家的公民了。
They have to give up their citizenship in the other country.
他们必须放弃其他国家的公民身份。
This can be difficult for people who love their home country very much,
对于热爱自己祖国的人来说，这将是一个非常艰难的决定。
because they might feel that they are betraying (or doing something against) the country they grew up in.
因为这会让他们觉得他们在背叛（或做不利于它的事）自己从小长大的祖国。
People who become U.S. citizens also must promise to obey (or follow) the laws of the United States and to defend (or help protect) the country's Constitution (or its most important legal document) and laws.
成为美国公民的人还必须承诺遵守美国法律并捍卫（或保护）美国宪法（或其最重要的法律文件）和法律。
This might mean speaking up (or saying something) when one sees that Americans' rights are in danger of being taken away.
这就意味着当一个人看到美国人的权利有被剥夺的危险时就要勇于站出来发声（或发言）。
Finally, people who become U.S. citizens must promise to serve (or do important work for) the country if it is needed.
最后，如果祖国有需要，成为美国公民的人必须承诺为它服务（为它做重要的工作）。
They also have to promise to serve in the U.S. military if needed.
如有需要，他们还必须承诺在美国服兵役。
Young men who become U.S. citizens need to register (or sign up) with the Selective Service so that their name is on the list of people who can be called to serve in the Army if there is a war.
成为美国公民的年轻人需要到美国兵役登记局登记（或报名），这样的话如果发生战争，就能召集名单上的人入伍。
译文为可可英语翻译，未经授权请勿转载！
