The former marine airman is an Australian citizen who's renounced his US citizenship.

这名前海军陆战队飞行员是一名澳大利亚公民，他已经放弃了美国国籍。

Universities have been unable to offer guidance because the position of the US citizenship and immigration service remain murky.

大学一直无法提供指导，因为美国公民和移民服务局的地位仍然不明朗。

How much of this history makes up the actual US citizenship test?

这段历史在多大程度上构成了实际的美国公民身份测试？

And US citizenship would probably  make that drain on the island even worse.

而美国公民身份可能会让岛上的资源消耗更加严重。

Let's be careful that—that we don't go after US citizenship and  forget that we have so much to lose.

让我们小心一点——我们不要在追求美国公民身份的同时忘记了我们会失去很多东西。