extraterrestrial + noun
作定语置于名词前，是最常见的用法，常与 life、intelligence、beings 等词搭配。
Astronomers have long searched for extraterrestrial life.
天文学家长期以来一直在寻找外星生命。
来自地球大气层外、太空或其他星球的；对地球或其环境而言是外来的。；起源于、位于或发生在地球或其大气层之外的；地球大气圈外的
Originating from outside Earth's atmosphere, from space, or from another planet; alien to Earth.
来自地球大气层外、太空或其他星球的；对地球或其环境而言是外来的。
Originating from outside of the Earth's atmosphere, from space, or from another planet; alien to Earth or its environment.
起源于、位于或发生在地球或其大气层之外的
originating or located or occurring outside Earth or its atmosphere
Scientists study extraterrestrial rocks to learn about the solar system's formation.
科学家研究地球外的岩石，以了解太阳系的形成。
用法提示：extraterrestrial 作为形容词，修饰 rocks，表示“来自地球外的”。
AI contextual example
The novel features a civilization that communicates with extraterrestrial beings.
这部小说描绘了一个与地球外生物交流的文明。
用法提示：extraterrestrial 作为形容词，修饰 beings，表示“地球外的”。
AI contextual example
Astronomers are searching for extraterrestrial life in distant galaxies.
天文学家正在遥远的星系中寻找地球外生命。
用法提示：extraterrestrial 作为形容词，修饰 life，表示“地球外的”。
AI contextual example
作定语置于名词前，是最常见的用法，常与 life、intelligence、beings 等词搭配。
Astronomers have long searched for extraterrestrial life.
天文学家长期以来一直在寻找外星生命。
作表语后用 in origin 说明来源，强调某物并非来自地球。
The dust particles are extraterrestrial in origin.
这些尘埃颗粒来源于地球之外。
用于强调某事物完全是地球上的，毫无外星色彩。
There is nothing extraterrestrial about the light in the sky.
天空中那道光并非来自外星。
grammar · medium
易错句子Astronomers listen for extraterrestial signals from deep space.
正确表达Astronomers listen for extraterrestrial signals from deep space.
拼写错误：extra- 与 terrestrial 拼接时漏掉了 terrestrial 中的第二个 r。-trial 这一部分来自拉丁语 terra（土地），terrestrial 拼作 t-e-r-r-e-s-t-r-i-a-l，所以 extraterrestrial 里共有三个 r。
grammar · medium
易错句子Scientists are still searching for extraterrestrial in the universe.
正确表达Scientists are still searching for extraterrestrial life in the universe.
extraterrestrial 在这里只是形容词，不能单独作介词宾语。汉语“寻找外星（生命）”可以省掉中心名词，英语却必须补出被修饰的名词（如 life、beings），或者改用可数名词复数 extraterrestrials。
grammar · medium
易错句子Foreign diplomats enjoy extraterrestrial rights in this country.
正确表达Foreign diplomats enjoy extraterritorial rights in this country.
词形混淆：治外法权是 extraterritorial，词根为 territorial（领土的）；extraterrestrial 的词根是 terrestrial（地球的），意思是“地球之外的”。两词前缀相同但词根不同，不能互换。
extraterrestrial 是科学或科幻语境中“地球之外的、外星的”；alien 还可泛指“外国的、陌生的”，且常见搭配 alien to 表示“对……不相容/陌生”，此时不能用 extraterrestrial。
interstellar 指恒星之间或星际空间中的，常修饰 travel、dust、space；extraterrestrial 强调来自地球或大气层之外的生命、物体、文明。
terrestrial 指地球的或陆地的，是 extraterrestrial 的反义；谈地球上的生物、岩石、环境时用 terrestrial，谈地球外来源时用 extraterrestrial。
extraterrestrial + life
extraterrestrial + intelligence
extraterrestrial + -ly
terrestri- + -al
terrestrial + -ly
non- + terrestrial
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