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Immigration wasn’t really a problem a long time ago. Many countries welcomed immigrants because they needed workers. The USA, Australia and Canada encouraged millions of people to come and live in their countries. Today, however, immigration is becoming a problem. Many countries are trying to control immigration. At election time, it is a major issue. Immigration today is big business. More and more people from poor countries want to live in rich countries. It is easier to travel nowadays because of cheap transport and more open borders. People risk their lives to get the chance of starting a new life in a rich country. This can cause anger in the countries immigrants go to. It is an issue that will be with us forever, I think.
n. 克制，控制，管制，操作装置
vt. 控制
