animal migration的用法和樣例：
例句
- Theirs is probably the longest migration flight.
這也許是最遠的遷移飛行。 - Migration of the seismic activity is found before a big event.
發現了大震前地震活動性的遷移。 - I freely admit the former existence of many islands, now buried beneath the sea, which may have served as haltingplaces for plants and for many animals during their migration.
我直率地承認，從前曾存在過許多島嶼可作為植物和許多動物遷移中歇足之地，現在都已埋在海下了。
