膝上截肢的英文：
above-knee amputation

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

The vet says amputate or he'll have to be put to sleep.
兽医说要么截肢，要么只有安乐死。

If a man had a gangrenous foot would you have patience with anyone who hesitated to amputate it?
如果一个人的脚得了坏疽而有人对于动截肢手术犹犹豫豫，你难道会对他有耐心吗？

fingers so badly frozen they had to be amputated; badly injured; a severely impaired heart; is gravely ill; was seriously ill.
冻伤太严重了的手指不得不切除；严重受伤；严重受损的心脏；病得很严重；病得很严重。

Tissue that has been partially detached and used in surgical grafting to fill an adjacent defect or cover the cut end of a bone after amputation.
组织部分切割下来的生物体组织，在外科移植中用以修补临近的身体缺陷处或在截肢后用来覆盖骨骼切除端

He agreed to have an operation to amputate his left foot which had become gangrenous
他同意做手术，截除坏疽的左脚。