我从未见过如此无私地关心孩子的人。I've never known anyone who cared so selflessly about children.你无私地帮助了我们.It was unselfish of you to help us.她永远不能像她们那样无私地爱什么事业或什么人.She could never love anything or anyone so selflessly as they did....

“无私地”的英语可以翻译为：selflessly ...