单词详解 

n.

膝， 膝盖 ，膝部 ( hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella)

His granny fell down and hurt her knee. 他奶奶跌倒了，摔破了膝盖。

相关词组

1. knee joint 膝关节；弯头结合

every step you take starts with bending of the knee joint. 你没迈出一步都会先弯曲膝关节。

2. on one's knee   跪着；恳求，哀求 

When I was a little girl, I used to sit on my father's knee. 小时候，我爱坐在父亲的膝盖上。

相关单词

复数：knees