实际上，目前约三分之一的移民在发达国家之间流动；三分之一的移民在发展中国家之间流动；只有三分之一的移民在发展中国家和发达国家之间流动。
Indeed, roughly one-third of migrants nowadays move between developed countries; one-third move between developing countries; and only one-third move from the developing to the developed world.