鸟类迁徙
The seasonal movement of birds.
鸟类的季节性移动。
季节性迁徙
Refers to the movement of animals or people that happens at a particular time of year.
指动物或人在一年中特定时间发生的移动。
年度迁徙
Migration that occurs every year.
每年都会发生的迁徙。
国际移徙
Movement of people between countries.
国家之间的人口流动。
国内移徙
Movement of people within a country.
一个国家内部的人口流动。
The movement of a very large number of people.
大规模迁徙
The movement of a very large number of people.
非常大量人口的移动。
城市迁移
Movement of people to cities.
人口向城市的移动。
非法移徙
Moving to another country without official permission.
未经官方许可移居到另一个国家。
When people are made to move from their home or country.
秋季迁徙
The movement of birds or animals south for the winter.
鸟类或动物为过冬而向南的移动。
秋季迁徙
The movement of birds or animals south for the winter.
鸟类或动物为过冬而向南的移动。
春季迁徙
The movement of birds or animals north for the summer.
鸟类或动物为度夏而向北的移动。
向内迁移
Movement of people into a country or region.
人口向一个国家或地区的移动。
向北迁徙
Movement towards the north.
指人或动物向北方的移动，通常是季节性的
向南的迁徙
Movement towards the south.
描述朝向南方的大规模移动或旅程