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当春季来临的时候，它们又开始向北迁飞。
When spring comes, they begin their long journey north.
youdao
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秋季一到，又到了鸟类飞迁的时候了。
Come autumn, it's time for the bird to prepare to migrate again.
youdao
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秋季一到，又到了鸟类飞迁的时候了。
Come autumn, it's time for the bird to prepare to migrate again.
youdao