migration

详细解释:n. 移民, 移往, 移动
【计】 迁移
【化】 迁移
【医】 移行

词型变化：

形容词:migrational

英语解释：

名词 migration:

the movement of persons from one country or locality to anothera group of people migrating together (especially in some given time period)(chemistry) the nonrandom movement of an atom or radical from one place to another within a moleculethe periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding

例句：

Scientists have studied the migration of fish over long distances.科学家研究过鱼类远距离回游的现象。