source of obligation造句

education, management and protaction constitute its basic content, which has both civil nature and executive nature . though schools " liability like education, protection and management is similar to guardians " obligation in a way, thre are great defferentes between them in legal sources of obligation and the retical grounds and time and space of performing liabilities . schools " taking charge of their own actions and guardians taking change of another person's action resemble in appearance but quite different in nature
尽管学校对学生的教育、管理、保护等职责与监护人的监护职责有类似之处，但二者在职责产生的渊源和理论基础、履行义务的时间、履行职责的空间及内容等方面均存在很大区别，学校是对自己行为承担责任，监护人则是对他人的行为承担责任，二者形相似，实相远。
It's difficult to find source of obligation in a sentence. 用source of obligation造句挺难的