kneecap

例句：

1. 1.She sat on the couch with her kneesup and her feet flat on the floor.
   她坐在沙发上，膝盖上翘，脚平放在地板上。
2. 2. The doctor advised himto rest his sore knees.
   医生建议他休息他的酸痛膝盖。
3. 3. Hehad to bend over topick up his kneecap.
   他不得不弯腰去捡起他的膝盖垫。