膝盖的英文：
knee

prayer bones
[美俚]膝盖

The boy's pants bagged at the knees.
那男孩的裤子在膝盖处鼓了出来。

Suddenly she felt a startling sensation of coldness about her knees and feet: it was water flowing under her.
突然间她感到膝盖和双脚冰凉，原来是水涌过来了。

More than 2% of the population aged over 55 suffers extreme pain as a result of osteoarthritis of the knee.
55岁以上的人群中有超过2%的人忍受着膝盖关节炎带来的极度痛苦。

The sharp rocks cut through his pants legs till his knees were scratched and bleeding.
尖利的岩石撕破了他的裤腿，划伤了膝盖，还流出血来。

She silently assented, and with her stool at arm's length, and the pail against her knee, went round to where they stood
她点了点头，就把牛奶桶挨着膝盖提着，把小凳子横着擎在手里，绕到他们站着的地方。

He'd made a vest, a shirt and the pants that were in vogue, with the crotch cut to the knees
他自己做过一件背心、一件衬衫和一条当时流行的裤档差不多落到膝盖那儿的裤子。

He has a pain in the knee.
他膝盖酸痛。

knee - length;floor - length.
长及膝盖的;拖地的

She skinned her knee.
她擦伤了膝盖

slide off the knee
从膝盖上滑落下来

He has a pain in the knee.
他膝盖酸痛。

The knee is in pristine condition.
膝盖已经恢复到正常的状态。

She grazed her knee.
她擦伤了膝盖。

knee joint flexion and extension exerciser
膝关节弯曲伸长训练器