immigration
/ˌɪmɪˈgreɪʃən/noun
mass noun
1- the action of coming to live permanently in a foreign country移居, 移民入境：
a barrier to control illegal immigration from Mexico.
制止墨西哥非法移民的障碍。
1.1
- the place at an airport or country's border where government officials check the documents of people entering that country边防检查站。