migrate

这些鸟每年冬天都会迁徙到南方。

These birds ___migrate south for the winter every year.

每年春天，这些蝴蝶都会迁徙到北方。

Every spring, these butterflies ___migrate to the north.

每年秋天，这些蝴蝶都会迁徙到更温暖的地方。

Every autumn, these butterflies ___migrate to warmer places.