Have an extraterrestrial being really in the world?

世界上真的有外星人么？

youdao

He was the first human being to set foot on an extraterrestrial world.

他是第一个人上设置一个外星世界英尺。

youdao

He was the first human being to set foot on an extraterrestrial world.

他是第一个人上设置一个外星世界英尺。

youdao