"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。”

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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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Look for the line that says "Non-resident Alien".

寻找写着“外籍非居留者”的那行。

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What is most important to establish and remember is that a passion for military non-interventionism is not alien to respectable American politics.

FORBES: GOP and War: Can History Repeat?

"Alien Big Cat" is the official term for a non-native, large cat, and refers to pumas and also to panthers, leopards, lynx, and any other big furry cat-like critter that is living wild.

BBC: The Surrey puma: Fact or fiction?