1.(foreign)外国的
He said they were opposed to the presence of alien forces in the region.他说他们反对外国军队驻扎在该地区。
2.(having foreign allegiance)具有外侨身份的；外侨的
3.(unfamiliar)陌生的
4.alien to sb/sth
(repugnant)与…格格不入的；与…不相容的
Malice was completely alien to his nature.他的本性完全没有恶的一面。
Such an attitude is alien to most businessmen.这样的态度是大多数商人所反感的。
5.(from outer space)+ being, spaceship(科幻小说中)外星的, 来自外星的