海星只用一条胳膊就能长出完整的新身体

Starfish can grow a whole new body from just one arm.

Imagine losing your arm, and then growing an entirely new you. That's what some starfish can do.

If a starfish loses an arm, it can grow that arm back. That's already amazing. But in some species, if one arm has a small piece of the center body attached, that single arm can grow into a completely new starfish.

So one starfish can become two starfish, just from losing an arm. That's like magic, but it's real science.

Of course, this takes time — weeks or even months. But still, wouldn't it be cool if humans could do that?

海星只用一条胳膊就能长出完整的新身体。

想象一下，你失去了一条胳膊，然后长出一个全新的自己。这就是某些海星能做到的事。

如果海星失去一条胳膊，它可以重新长出来。这已经很神奇了。但在某些种类的海星中，如果那条胳膊连带一小块身体中心部分，那么单独一条胳膊就能长成一只全新的海星。

所以一只海星可以变成两只海星，仅仅因为失去了一条胳膊。这就像魔法一样，但它是真实的科学。

当然，这需要时间——几周甚至几个月。