0 the middle joint of the leg that allows the leg to bend -- 膝，膝盖
The baby was crawling around on its hands and knees. 宝宝用手和膝盖着地爬来爬去。
He got/went down on his knees (= got into a position where his knees were on the ground) in front of the altar. 他在圣坛前跪下。
She took the child and sat it on her knee (= on the part of the leg above the knee when sitting down). 她抱起孩子放在自己的膝盖上。
She was wearing an old pair of trousers with rips at the knees. 她穿着条旧裤子，膝盖处破了。
1 to hit someone with your knee -- 用膝盖撞击
She kneed him in the groin. 她用膝盖猛撞了他的下身。
Make sure you bend your knees when you're picking up heavy objects.
She sat back in her chair and wrapped her arms around her knees.
Football socks go up to the knee, don't they?
The children sat as close to the flames as possible with their knees slightly touching.
They started travelling after five rainless days, so that the river water never reached above their knees.
The knees, hips and ankles are considered as uniaxial frictionless joints.
