If we could rejuvenate, of course it would be different. But we can't.

我如果能够返老还童，那又是另外一回事了，可惜办不到。

Members of the species can reverse the aging process so that instead of expiring, they reconstitute themselves as juveniles.

水母可以逆转老化过程，因此不会死亡，反而能返老还童。

They believed that this water could make old people young again. Ponce de Leon never found it.

他相水可以返老还童，庞塞·德·莱昂没有找到。

" Dostn't wish wast young again, I say? There's a hole in thy poor bellows nowadays seemingly."

“我说，你是想返老还童吗？你那破风箱已经有洞，漏风了。”

But for that, they needed a way to  tell if their de-ageing process was working.

但为此，他需要一方法来判断他的返老还童过程是否有效。

If only we could be children again.

噢，鲍里斯，我真希望我能返老还童。

We both felt like we were kids again.

都觉得像是返老还童了。

We don't know if the template to youth  really is hidden inside each of our cells.

旁白：我不知道返老还童的秘诀是否真的隐藏在我每个细胞内。