migration

n. /maɪˈɡreɪʃn/ B2

迁徙；移居

The movement of people or animals from one region to another.

仙境例句

The Gryphon told Alice about a great migration, when whole villages moved to live under the sea.

狮鹫给爱丽丝讲了一次大迁移：那时候，一个个村子的人全都搬到海底去住了。