noun 下载 🔗分享 飞米 An obsolete unit of length equal to one femtometer or femtometre (10−15 m). Examples : "The scientist used the fermi as a unit of measurement in his research paper. " 这位科学家在他的研究论文中使用飞米作为长度单位。 physics unit science 与AI对话词汇游戏阅读练习