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。
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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