illegal alien
collocation非法移民；非法居留者
The new law targets illegal aliens.
新法律针对非法移民。
外星人；外星生命
先理解核心含义，再看它在真实句子里的用法。
外星人；外星生命
A life form from outer space or another dimension; an extraterrestrial being.
An alien must obtain a work visa before taking a job in this country.
外国人在这个国家工作之前必须获得工作签证。
来自外部的生物或事物
A person, animal, plant, or other thing which is from outside the family, group, organization, or territory under consideration.
外侨,非本国公民
a person who comes from a foreign country; someone who does not owe allegiance to your country
他国公民或国民
A citizen or national of another sovereign state.
异类,不融入环境者
anyone who does not belong in the environment in which they are found
The science fiction movie features friendly aliens who visit Earth.
这部科幻电影讲述的是访问地球的友善外星人。
After moving to the small town, she felt like an alien among the locals.
搬到小镇后，她在当地人中感觉自己像个异类。
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非法移民；非法居留者
The new law targets illegal aliens.
新法律针对非法移民。
外籍居民；有居留权的外国人
She has a green card and is considered a resident alien.
她持有绿卡，被视为外籍居民。
敌国侨民；敌国公民
Enemy aliens were required to register with the authorities.
敌国侨民被要求向当局登记。
太空外星人；外星人
He claims he saw a space alien in his backyard.
他声称在后院看到了一个外星人。
外星人入侵
The story is about an alien invasion of Earth.
这个故事讲述外星人入侵地球。
外星人绑架；外星人劫持
She wrote a book about her alleged alien abduction.
她写了一本关于自己声称被外星人绑架的书。
我是一个外来者，一个合法的外来者，我是一个在纽约的英国人。
Many foreign students feel like aliens at the beginning of their stay.
许多留学生在刚到异国时都会感到自己像个外人。
如果外星人来访，其结果将和哥伦布到达美洲时一样——对美洲原住民来说并不好。
Many sci-fi films feature friendly aliens.
许多科幻电影都有友好的外星人角色。
Use alien naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：读作“诶理恩”，想象一个外星人站在人群外，格格不入——alien既是外星人，也是外来者、异类。
语域：mixed 常见场景：法律/移民文件、科幻作品与日常谈论外星人、文学或正式语境的局外人 作名词时，alien 的语体随义项变化：在法律或移民语境中较正式，指外侨或外国人；在科幻或口语中很常见，指外星人；指局外人时偏文学或正式。使用时应结合具体义项选择。
与 alien /ˈeɪliən/ 押韵（重读元音及之后读音相同）的是 Australian /ɒˈstreɪliən/。注意：salient /ˈseɪliənt/ 拼写相近且重读元音相同，但末尾多出 /t/，不算完全押韵；patient /ˈpeɪʃənt/ 以 -ient 结尾却读作 /ʃənt/；Italian /ɪˈtæljən/ 的 -lian 与 -lien 拼写相近但元音不同；lien /liːn/（也读 /ˈliːən/）只是恰好与 alien 的尾拼相同，读音差异很大。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.