kefalasCOCA²¹²³¹⁹ 基本例句 🌏凯法拉斯 In their study of a group of low-income single moms in the Philadelphia area, Kathryn Edin and Maria Kefalas observed a “norm of self- sacrifice” among the women they interviewed. 在他们对于一组在费城单亲母亲低收入的家庭的调查中， Kathryn Edin和 Maria Kefalas在他们采访这些女士中发现 “自我牺牲的法则”。 yeeyan