许多科学家认为从亚洲迁移到北美洲的本土原始居民，不是突然迁移的而是一波一波经过数千年迁移过去的。这句话这么理解对吗？
Most scientists think that the native peoples migrated originally from Asia to North America, not all at once but in wave after wave over thousands of years.
这是因为，在美洲，最老的Y染色体血统起源于亚洲中部于15,000至20,000年以前，然后迁移到东北部跨过白令海峡。
This is because the oldest Y-chromosome lineage in the Americas originated in Central Asia 15,000-20,000 years ago, and then migrated to the northeast, across the Bering Strait.
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