organ transplant surgery
noun [ U ] US uk/ˌɔː.ɡən ˈtræn.splɑːnt ˌsɜː.dʒər.i/ us/ˌɔːr.ɡən ˈtræn.splænt ˌsɝː.dʒɚ.i/ (UK spare part surgery)
器官移植手术
the process of taking a healthy organ such as a heart or lung from a person who has just died and putting it into a living person to replace an organ that is not working properly