lifesaverWiktionary 原文中文来自 ECDICTn.救命者，救生员，济急的人构词拆分life词根/词干+saver词根/词干词源说明From life + saver.释义（英文）名词 NounSomeone or something that saves lives.(figurative) Someone or something that is very useful or helpful.词族相关词（1）save someone's life