See, hydra bodies are really simple: one head and one foot lined up along a single body axis.

看，水螅的身体真的很简单：一个头和一只脚沿着一个身体轴排成一行。

As you might guess, your axial bones are found along your body's vertical axis — in your skull, vertebral column, and rib cage.

正如你可能猜到的，你的中轴骨沿着你身体的垂直轴——在你的头骨、脊柱和胸腔中。

So these regenerated hydra were more deformed, and usually had multiple body axes – like two mouths and two feet.

所以这些再生的九头蛇更加变形，而且通常有多个身体轴——比如两张嘴和两只脚。