illegal alien

基本解释

All the followers of Jesus,according to this writer, live in the Roman Empire as illegal aliens basically, or not illegal aliens but definitely as aliens.
根据这个作者，所有耶稣的追随者，基本上都是作为非法入境者生活在罗马帝国，或者不是非法入境者，但肯定是外邦人。
Hostility towards Mexicans spread to the United States where talkshows referred to "fajita flu" and "infected illegal aliens", injecting fresh rancour into the immigration debate.
对墨西哥人的敌意也开始在美国扩散。一些脱口秀用到“法士达流感”（译者：法士达，即墨西哥肉卷，在此带有一定侮辱性）和“被感染的非法移民”等称呼。
With a multiple entry visa, no one needs to stay in America as illegal aliens, and the US visa department will not need to reject them based on their possible intent of not leaving the USA.
有了多次入境的签证，没有人需要留住在美国做非法居留的外国人，而美国签证部门也将不再需要以他们可能意图不离开美国为由而拒绝他们签证。

They also demanded the President issue a moratorium on deportation and detention of suspected illegal aliens until federal immigration reform is passed.
and especially the way that we treat illegal aliens.
尤其是改变一下我们对待非法移民的方式。
美国的移民法 - SpeakingMax英语口语达人

Illegal aliens could potentially add millions to the shrinking ranks of America's labor unions.
FORBES: Labor Won't Embrace Immigrants
Further, we must be watchful of illegal aliens voting in current and the presidential race.
FORBES: U.S. Needs Immigration Reform

someone who lives or works in another country when they do not have the legal right to do this