指关节

He cracked the joints of his fingers.

他把手指弄得劈啪作响。

Our fingers bend at the knuckle.

我们的手指在指处弯曲。

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

他的胳膊只破损的指南针，早已不再条胳膊，却成加上条胫骨的指。

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.

人体中最常见的运动，如指和肩等，处的个囊状物把两根骨头结合在起。