While it ' s common for people from poorer countries to migrate to developed , wealthier nations , experts found there was also migration between developing countries - for example , from guatemala to mexico 当从非常贫穷的国家的人们移民到富裕的发达国家称为常事时，专家们发现，发展中国家也有移民，比如从危地马拉到墨西哥。
