n. a joint of a finger when the fist is closed
v. press or rub with the knuckles
v. shoot a marble while keeping one's knuckles on the ground
n. 指节, 蹄爪, 膝关节
v. 以指节打, 以手指射
1. She hit her knuckle on the table by accident.
她不小心把指关节撞到了桌子上。
2. He cracked his knuckles before starting the game.
他在开始比赛前掰了掰指关节。
3. The doctor examined her swollen knuckle carefully.
医生仔细检查了她肿胀的指关节。