Although they do make use of cartilage and fibrous connective tissues like ligaments, they're different in that the bones they join are separated by a fluid-filled joint cavity.

尽管它们确实利用了软骨和像韧带这样的纤维结缔组织，但它们的不同之处在于，它们连接的骨骼被一个充满液体的关节腔隔开。

As you might guess, your cartilaginous joints unite bones using cartilage, and are similar to their fibrous brethren in that they don't move very much, and they lack a joint cavity.

正如你可能猜到的，你的软骨关节用软骨连接骨头，和它们的纤维兄弟相似，它们不怎么移动，也没有关节腔。

So, the structural classification of your bones is all about what kind of material binds those bones together — like, is it a fibrous tissue or cartilage, or a special fluid-filled joint cavity.

所以，骨骼的结构分类就是关于是什么材料把这些骨骼结合在一起——比如说，是纤维组织还是软骨，或者是一个特殊的充满液体的关节腔。