There is nothing the matter with the United States except ... the parlor socialists, up-lifters, and do-goods.The form do-gooder appears in American English from 1927, presumably because do-good was no longer felt as sufficiently noun-like. A slightly older word for this was goo-goo.
来自《简明英汉词典》
来自金山词霸
来自美剧《凯莉日记》
来自金山词霸 每日一句
来自《傲慢与偏见》