If you grow to regret your decision to resign as an American, advisers warn that is difficult to become one again as you will be treated like any other non-resident alien of the US.
顾问警告说一旦对放弃美国国籍的行为感到后悔，再想恢复美国国籍就很困难，之后所受的待遇也和在美没有居留权的外国人一样。
"Invasive alien species are non native species which are accidentally or intentionally introduced into new areas. They range from microbes to mammals," Dr MacKinnon says.
麦克·金南博士说，“侵入性外来物种是偶然或故意被引入新地区的非本土物种，其范围涉及从微生物到哺乳动物的多个物种。”
Astronomers have been scouring the galaxy for decades for alien-produced radio signals — and more recently for non-naturally occurring light pulses, as well — to no avail.
几十年来，天文学家一直在探寻来自外星人发出的无线电信号，最近还在寻觅非自然发生的光脉冲，但却都一无所获。
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