kneecap

n. 膝盖骨,护膝

kleptomania, kleptomaniac, km, kn, knack, knacker, knacker's yard, knackered, knapsack, knave, knavery, knavish, knavishly, knead, knee, knee-breeches, knee-deep, knee-high, knee-jerk, knee-length, kneecapping, kneel, kneel down, knees-up, knell, knew, knick-knack (also nick-nack), knickerbockers, knickers, knife, knife-edge, knight, knight errant (pl knights errant), knighthood, knightly, knit, knitter, knitting, knitting-machine, knitting-needle,