We're carbon-based lifeforms because there's a lot of carbon on Earth, but perhaps on another planet, something like silicon is the most abundant element, and therefore life could evolve from that.
人体的主要构成元素是碳,因为地球上有很多碳,但或许
其他星球上就不是这样。其他星球上大量
的可能是硅元素,那么外星生命就是以硅元素为基础的。