And he continues, "Therefore, in order to prevent these problems, the calcium:phosphorus ratio should be at least 2:1." (2 parts calcium: 1 part phosphorus.)
」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」＜第２章　物質の構成粒子＞（教p19-）