纵观历史，人们仅知道宇宙中只有一个地球存在，然而，用不了多不久，可能会出现一个新的，接着，又是一个。
Throughout history, only one Earth has been known to exist in the universe. Soon there may be another.
纵观历史，人们仅知道宇宙中只有一个地球存在，然而，用不了多不久，可能会出现一个新的，接着，又是一个。
Throughout history, only one Earth has been known to exist in the universe. Soon there may be another.
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