指关节

He cracked the joints of his fingers.

他把手弄得劈啪作响。

Our fingers bend at the knuckle.

我们的手处弯曲。

His arm looks like a broken compass;it's not an arm any more, but a knucklebone with a shank attached.

他的胳膊活像一只破损的南针，早已不再是一条胳膊，却成加上一条胫骨的。

The most common type of joint in the human body is the diarthrodial joint -- knuckles and shoulders are examples -- in which two bones come together in a capsule.

人体中最常见的是运动，如和肩，处的一个囊状物把两根骨头结合一起。