kingpin

n 1 (engineering 工) vertical bolt used as a pivot 主销; 主螺栓. 2 (fig 比喻) essential person or thing 主要的人或事物: He's the kingpin of the whole team. 他是全队的主力.

kindergarten, kinding, kindle, kindliness, kindling, kindly, kindness, kindred, kinetic, kinetic art, kinetically, kinetics, king, king-size (also king-sized), kingcup, kingdom, kingfisher, kingliness, kingly, kingmaker, kingship, kink, kinkiness, kinky, kinsfolk, kinship, kinsman, kinswoman, kiosk, kip, kipper, kirk, kirsch, kismet, kiss, kissable, kisser, kit, kitbag, kitchen,