她通过社区服务来赎自己年轻时犯下的罪过。

She performed community service as an expiation for the mistakes she made in her youth.

expiation 是名词，来自动词 expiate（赎罪、补偿）。ex- 前缀表示"向外、彻底"，-piate 部分与拉丁语 piare（净化）相关，整个词表示"通过某种行为来弥补或消除罪过"。expiation 指"赎罪的行为或过程"。