migration
n. 移民，迁徙；（计算机系统的）改变，（程序或硬件的）迁移，转移
复数 migrations
例句
During the last recession, migration to the sunbelt accelerated.
前一个经济萧条期间，向美国南部阳光地带移民的速度加快了。
《柯林斯英汉双解大词典》
Now, migration is a natural survival strategy.
现在，迁徙是一种自然的生存策略。
They have led some birds to give up on migration.
它们导致一些鸟类放弃迁徙。
