But was there one major wave of migration across the Bering Strait into the Americas, or several?

但是有没有一次或几次大移民浪潮是穿过白令海峡到达美洲的呢？

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The third wave, perhaps 10,000 or 9,000 years ago, saw the migration from North-east Asia of groups ancestral to the modern Eskimo and Aleut.

第三次浪潮大约发生在一万或九千年前，见证了东北亚的祖先群体向现代爱斯基摩人和阿留申人的迁移。

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"Old America seemed to be breaking up and moving westward," observed an English visitor in 1817, during the first great wave of migration.

1817年，在第一次移民大潮中，一位英国游客观察到：“古老的美洲似乎正在分裂并向西移动。”

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Both he and his wife, Helen, were children of Italians who came to America in the great migration wave of the early twentieth century.

NEWYORKER: Mayberry Man

This is the second migration wave sparked by the Arab Spring.

BBC: Italy is rocky shore for Europe's boat people

The wave of migration from eastern Europe has been good for the economy.

ECONOMIST: Migration from eastern Europe