migratory instinct
... 迁移度：degree of migration 迁移本能：migratory instinct 迁延照射：Protracted irradiation ...
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它们饿了就去找东西吃，累了就找地方休息，它们本能地知道，什么时候应该迁移到什么地方去。
When they are hungry, they look for food; when they are tire, they rest. By the light of nature they know when and where to migrate.
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