1. Finally, First Phase of Server Migration Over! 最后，第一阶段的服务器迁移！
2. The nuclear problem of urbanization is the dynamic mechanism of population village-city migration. 人口乡村-城市迁移的动力机制问题是城市化问题的核心。
3. Only monarchs born in late summer or early fall make the migration, and they make only one round trip. 只有蝶王出生在深夏或者初秋，这使得它们要移民，并且它们只有一次往返旅行。
英英解释
n.
1. the movement of persons from one country or locality to another
2. a group of people migrating together (especially in some given time period)
3. (chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule
4. the periodic passage of groups of animals (especially birds or fishes) from one region to another fo
