他拳击时擦伤了指节。

He bruised his ___knuckle while boxing.

她紧紧抓住栏杆时指节都变白了。

Her ___knuckles turned white from gripping the railing tightly.

手指弯曲处的关节被称为指节。

The joint where your finger bends is called the ___knuckle.