alien

stranger, foreigner, alien, immigrant

这些名词均有“陌生人，外人”之意。
stranger: 指对当地的生活习惯、语言等不熟悉，或为某团体不熟的人，也指不认识的人。
foreigner: 指在异国作短期访问或长期居住的外国人。
alien: 指没有成为侨居国正式公民的移民。
immigrant: 指在别国定居并取得所在国国籍的外国人。

名词 alien:

1. a person who comes from a foreign country; someone who does not owe allegiance to your country
   同义词：foreigner, noncitizen, outlander
2. anyone who does not belong in the environment in which they are found
   同义词：stranger, unknown
3. a form of life assumed to exist outside the Earth or its atmosphere
   同义词：extraterrestrial being, extraterrestrial

动词 alien:

1. transfer property or ownership
   同义词：alienate
2. arouse hostility or indifference in where there had formerly been love, affection, or friendliness
   同义词：estrange, alienate, disaffect

形容词 alien:

1. not contained in or deriving from the essential nature of something
   同义词：foreign
2. being or from or characteristic of another place or part of the world
   同义词：exotic

1. I ran into an old friend in the alien land.
   我在异国他乡遇到故知。
2. After the alien spacecraft had hovered over the park for a short time, it vanished.
   那只外星来的宇宙飞船在公园上空盘旋了一会儿之后就不见了。
3. Immigrant workers were classed as resident aliens.
   移民来的工人已归入外侨类。
4. After being away for so long, he feels like an alien in his own country now.
   背井离乡这么久，现在在他自己的国家，他觉得自己像个外人。
5. Cruelty is quite alien to his nature.
   残忍完全不合他的本性。
6. Their ideas are quite alien to our ways of thinking.
   他们的观点同我们看问题的方法格格不入。