spare-part surgery
noun [ U ] UK uk/ˌspeəˈpɑːt ˌsɜː.dʒər.i/ us/ˌsperˈpɑːrt ˌsɝː.dʒər.i/ (US organ transplant 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 correctly