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Today the frontier is space and the boundaries of human knowledge.
今天的荒漠就是太空和人类知识没有达到的疆域。
youdao
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Today, the frontier is space and the boundaries of human knowledge.
如今，边境是空间和人类知识的界限。
youdao
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Today, the frontier is space and the boundaries of human knowledge.
如今，边境是空间和人类知识的界限。
youdao