Definition: one of the parts of your finger where it bends Level: C2
她在粗糙的墙上擦伤了指关节。
She scraped her ___knuckles against the rough wall.
他握紧拳头，指关节都发白了。
He clenched his fists so tightly that his ___knuckles turned white.
拳击手淤青的指关节证明了他训练的艰苦。
The boxer's bruised ___knuckles were a testament to his rigorous training.
