2The broad definition of migration,"permanent change of residence",usually includes a move across a city or a town.What we are concerned about is movement between nations,not internal migration within nations,although such movements often go beyond international movements in volume.Today,the motives...
题目The broad definition of migration,"permanent change of residence",usually includes a move across a city or a town.What we are concerned about is movement between nations,not internal migration within nations,although such movements often go beyond international movements in vo...