半个多世纪前，科幻小说中设想出这样一个未来：对于人类而言，太空之旅已成为平常事。他们居住在位于其他银河系或海底的殖民地之上。
More than a half century ago science fiction envisioned a future where human beings made routine space trips. They lived in colonies in other galaxies or on the seabed.
半个多世纪前，科幻小说中设想出这样一个未来：对于人类而言，太空之旅已成为平常事。他们居住在位于其他银河系或海底的殖民地之上。
More than a half century ago science fiction envisioned a future where human beings made routine space trips. They lived in colonies in other galaxies or on the seabed.
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