lt's a little crazy for me to be writing about migration patterns without actually knowing how they stay underwater for so long.
对我来说,在不知道它们是如何在水下呆这么久的情况下,写它们的洄游模式有点疯狂。
But however birth rates and migration patterns change, America's geographical size will be a huge advantage.
但无论出生率和迁移模式怎样变化,美国的地理广度都将是巨大的优势。
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