aliens

n.

a person who comes from a foreign country; someone who does not owe allegiance to your country

同义词：foreignernoncitizenoutlander

anyone who does not belong in the environment in which they are found

同义词：strangerunknown

a form of life assumed to exist outside the Earth or its atmosphere

同义词：extraterrestrial beingextraterrestrial

1. Many science fiction movies feature aliens visiting Earth.
   许多科幻电影都描绘了外星人造访地球。
2. According to immigration laws, aliens must register within 30 days of arrival.
   根据移民法规定，外籍人士必须在入境后30天内登记。