Alien means belonging to a different country, race, or group, usually one you do not like or are frightened of.
foreign
He said they were opposed to what he described as the presence of alien forces in the region.
他说他们反对他所描述的在该地区有外国军队的存在。
If something is alien to you or to your normal feelings or behaviour, it is not the way you would normally feel or behave.
Such an attitude is alien to most businessmen.
大多数商人对这种态度感到很陌生。
aliens
An alien is someone who is not a legal citizen of the country in which they live.
Both women had hired illegal aliens for child care.
这两个女人都曾雇佣过非法入境者来照看孩子。
In science fiction, an alien is a creature from outer space.
aliens from another planet.
从另一个行星来的外星人。