Traditional Culture Encyclopedia - Almanac inquiry - What do you mean by "migration"?

What do you mean by "migration"?

In ancient times, "migration" meant moving, but in modern times it usually refers to migratory birds.

The theme is explained as follows:

Let's go, let's go. 2. change; Change 3. Periodically migrate from one area or climate zone to another for food or reproduction. 4. Be called up for long-distance service.