Backknee
[醫] 膝反屈
??? 情景例句
We're off to the animal shelter.
我們這就去動物收容所。
I ought to take his advice.
我應該接受他的勸告。
And you lent me some money too, which I never repaid you.
你還借給我一些錢，這筆錢我還沒有還你呢。