Finally, there are the diarthroses, which are fully movable, like your classic knee and elbow joints. They're mostly found in your limbs.

最后，还有可动关节，它们是完全可移动的，就像你经典的膝关节和肘关节。它们大多存在于你的四肢中。

They conclude that Lucy could straighten her knee joints, enabling her to stand and walk upright as we do and thereby inhabit grasslands, but also that her big, powerful leg muscles helped her live in trees like modern apes.

他们得出的结论是，露西可以伸直她的膝关节，使她能够像我们一样站立和直立行走，从而生活在草原上，而且她巨大而有力的腿部肌肉可以帮助她像现代猿类一样生活在树上。