extraterrestrial的音標為[?ekstr??te?r?st(?)l]，基本翻譯為“外星人；地球以外之生命體”，速記技巧為“extra-特別地；terrestrial地球的”。

Extraterrestrial這個詞源自拉丁語“extra”和“terra”，意思是“地球之外的”。它的變化形式包括復數形式“extraterrestrials”，過去式和過去分詞形式“extraterrestrialized”以及現在分詞形式“extraterrestrializing”。

相關單詞：

1. Alien：這個詞源自拉丁語“alienus”，意思是“不屬于本地的，外來的”。這個詞常用來指外星人，表示與地球人類不同的生物。

2. Outerspace：這個詞源自“outer”和“space”，意思是“太空”。這個詞常用來表示宇宙空間，與地球表面或地球大氣層以外的空間。

3. Interstellar：這個詞源自拉丁語“inter”和“stella”，意思是“在星星之間”。這個詞常用來表示在星系之間的空間，也就是星際空間。

4. Exobiology：這個詞源自“exo”和“biology”，意思是“外星生物學”。這是一個學科，研究外星生命的存在、特征和可能的生存環境。

5. Extradimension：這個詞源自“extra”和“dimension”，意思是“超越維度”。這個詞常用來指存在于超越我們通常理解的維度中的物質或現象。

以上這些單詞都與extraterrestrial相關，描述了與地球人類不同的生命形式和宇宙中的神秘現象。這些單詞的出現和發展，也反映了人類對于未知領域的探索和好奇。

短語：

1. extraterrestrial life

2. extraterrestrial intelligence

3. extraterrestrial exploration

4. extraterrestrial environment

5. extraterrestrial matter

6. extraterrestrial civilization

7. extraterrestrial intelligence hypothesis

例句：

1. We hope to find extraterrestrial life somewhere in the universe.

2. The discovery of extraterrestrial intelligence could change our understanding of the universe.

3. Extraterrestrial exploration is a challenging task for future generations.

4. The environment on extraterrestrial planets may be very different from our own.

5. We need to be careful not to contaminate extraterrestrial environments with our waste products.

6. There may be extraterrestrial civilizations out there that we have yet to discover.

7. The idea of extraterrestrial intelligence is a fascinating topic for science fiction writers.

英文小作文：

If we discover extraterrestrial life, it would be a profound moment for humanity. We would have to consider the implications of such a discovery for our understanding of ourselves and the universe around us. It could lead us to question our place in the cosmos and inspire us to explore further into the unknown depths of space. However, it would also raise many ethical and scientific challenges, such as the possibility of encountering hostile environments or other lifeforms that could pose a threat to our own species. Therefore, we need to be prepared and have a clear plan of action in place to ensure that any discoveries are handled safely and responsibly. Ultimately, the discovery of extraterrestrial life would be a testament to the resilience and creativity of the human spirit, and would undoubtedly inspire us to push forward and expand our understanding of the universe in new and exciting ways.