指关节

He cracked the joints of his fingers.

把手指弄得劈啪作响。

Our fingers bend at the knuckle.

我们手指在指处弯曲。

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

膊活像一只破损指南针，早已不再是一条膊，却成加上一条胫骨指。

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.

人体中最常见是运，如指和肩等，处一个囊状物把两根骨头结合在一起。