这些研究都在逼近一个最为核心的问题：人类，究竟能不能在太空繁衍生息，这也是人类走向深空的必经之路。
Greek: mostly fine, with exceptions
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Roud then ventures a theory of his own: the custom, he argues, probably developed from a children’s game called Tig-touch-wood that was popular in early 19th century England.，更多细节参见heLLoword翻译官方下载
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