Definition: the middle part of your leg where it bends Level: B1
她滑雪时膝盖受了重伤。
She suffered a serious ___knee injury while skiing.
那个婴儿正用双手和膝盖爬来爬去。
The baby was crawling around on its hands and ___knee.
他在祭坛前单膝跪地。
He got down on his ___knee in front of the altar.
