About three billion years ago, multicellularity evolved.

大约在三百万年前， 出现了多细胞生物。

The dying cell sacrifices its life so that the group can reproduce--a hallmark of multicellularity.

垂死的细胞牺牲了自己的生命，这样群体就可以繁殖——这是多细胞生物的标志。

The team conducted the same experiment with Chlamydomonas and again, a kind of multicellularity was quick to appear.

该团队对衣藻进行了同样的实验，很快又出现了一种多细胞生物。

The descendants of that one little hangry cell went on to evolve multicellularity, forming bodies composed of multiple cells held together by rigid walls.

那个小饥饿细胞的后代继续进化成多细胞，形成由刚性壁连接在一起的多个细胞组成的身体。

It's been thought that the evolution of multicellularity must have been a major genetic leap but new research suggests that it wasn't such a difficult transition after all.

人们认为多细胞生物的进化一定是一次重大的基因飞跃，但新的研究表明，这毕竟不是一个如此困难的转变。