VERB
(鸟类、鱼类、兽类等随季节变化)迁徙
When birds, fish, or animals migrate, they move at a particular season from one part of the world or from one part of a country to another, usually in order to breed or to find new feeding grounds.
例句
Most birds have to fly long distances to migrate.
绝大多数鸟类为了迁徙都不得不进行长距离的飞行。
...a dam system that kills the fish as they migrate from streams to the ocean.
导致鱼类在从溪流向海洋迁徙途中死亡的水坝体系