名詞 extraterrestrial:

1. a form of life assumed to exist outside the Earth or its atmosphere
   同義詞：extraterrestrial being, alien

形容詞 extraterrestrial:

1. originating or located or occurring outside Earth or its atmosphere

1. Presented a careful argument for extraterrestrial life.
   提出關于地球外生命的詳細論證

ex.tra.ter.res.tri.al

adj.（形容詞）
Originating, located, or occurring outside Earth or its atmosphere:
地球外的：源于，存在或位于地球和大氣層之外的：
例句：
intelligent extraterrestrial life.
地球外的智慧生命

【引伸】
ex.traterres.trial
n.（名詞）