长生不老则会扰乱这个系统——这个系统需要为新的、更好的生命留出空间。

Immortality would disturb this system—it needs room for new and better life.

有些动物很可能可以在理想的环境下达到长生不老，比如海鞘、特定种类的珊瑚、九头蛇、灯塔水母（不死的海蜇）。

The animals that can possibly achieve immortality under ideal conditions, such as sea squirts, certain corals, Hydra, and Turritopsis nutricula (the immortal jellyfish), often activate telomerase.