stranger

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 stranger:

1. anyone who does not belong in the environment in which they are found
   同义词：alien, unknown

形容词 strange:

1. being definitely out of the ordinary and unexpected; slightly odd or even a bit weird
   同义词：strange, unusual
2. not known before
   同义词：strange, unknown
3. relating to or originating in or characteristic of another place or part of the world
   同义词：foreign, strange

1. His habitual place at the table was occupied by a stranger.
   他惯常坐在桌旁的位置被一个陌生人占据了。
2. She was accosted by a complete stranger.
   有一个她完全不认识的人过来和她搭讪。
3. Never put your trust to a stranger.
   绝不要相信陌生人。
4. We must pay special attention to the mysterious stranger.
   我们必须对那个神秘的陌生人严加注意。
5. She is no stranger to misfortune.
   她对不幸的经历并不陌生。
6. They taught the little boy not to talk to strangers.
   他们教育小男孩不要和陌生人说话。