名词
中文翻译：Unknown
同义词：
['emigration', 'dispersal', 'drift', 'movement', 'migration']
例句：
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1. The migratory birds fly south for the winter.
候鸟飞往南方过冬。
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2. The company's headquarters are located in the city center.
公司总部位于市中心。
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3. The river is a natural barrier that separates the two countries.
这条河流是两国的自然分界线。