great migration period
大迁徙时期
以上为机器翻译结果,长、整句建议使用 人工翻译 。
By looking at the fossil record from that period of time - before the Red Sea was formed - we can gain a clearer view of which species survived this great migration and which did not.
通过观察这一时期——红海形成之前——的化石记录,我们就能更清楚地知道哪些物种在这次大迁徙中活了下来,哪些没有。
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An earlier period of great migration came to an end, for example, when America some 90 years ago shut its doors to immigrants for a while.
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