extraterrestial civilization

• 地外文明

extraterrestial civilization的用法和样例：

例句

1. The archeologist said that the pyramids are the remnants of an alien civilization.
   里边的考古学家说这些金字塔是一种地域外文明的遗迹。
2. Discovering just one extraterrestrial civilization would have profound significance.
   仅仅发现一个地外文明世界就会具有很深的意义。