什么叫独立学校的lifer?

 
— 1 : a person sentenced to imprisonment for life. 2 : a person who makes a career of one of the armed forces. 3 : a person who has made a lifelong commitment (as to a way of life)
 
查了下字典,显然是第3种,怎么理解中小学生和致力一生的生活方式的关系?
 
 
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