pro bono
adjective, adverb uk/ˌprəʊ ˈbəʊ.nəʊ/ us/ˌproʊ ˈboʊ.noʊ/
（指已经做了的工作，尤指律师的工作）未要求收费的
(relating to work that is done, especially by a lawyer) without asking for payment
pro bono cases/lawyers/work 未要求收费的案子／律师／工作
He takes on some charity cases pro bono. 他接收一些慈善机构的案子，不要求收费。