“(ii) children under 21 years of age, including any optional targeted low-income child (as such term is defined in section 1905(u)(2)(B)); or
」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」＜第２章　物質の構成粒子＞（教p19-）