If life has arisen only once on any -- life could originate once per planet, could be extremely common or it could originate once per star or once per galaxy or maybe only once in the entire universe, in which case it would have to be here.
如果生命能够在 每颗行星上，每颗恒星甚至 每个星系都起源一次的话，那生命体将会变得非常普遍 但生命只在整个宇宙中起源一次的话， 那这只会是我们所处的这个宇宙了。