... migratory concentration 运移富集 migratory direction 运移方向 migratory group 迁移群 ...
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He noticed that as they fluttered around in the cage, they often launched themselves in the direction of their normal migratory route.
他注意到，当它们在笼子里到处飞的时候，通常会朝着常规的迁徙路线的方向。
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