名词
中文翻译：迁徙运动
同义词：
['migration', 'migration movement', 'migratory behavior']
例句：
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1. The migratory birds fly thousands of miles to reach their breeding grounds.
迁徙的鸟类飞行数千英里以到达它们的繁殖地。
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2. The migratory bird population has been declining due to climate change.
由于气候变化，迁徙鸟类的数量正在下降。
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3.The migratory bird species is a vital part of the ecosystem.
迁徙鸟类物种是生态系统的重要组成部分。