absence without leave

1. How do you account for your long absence from classes without asking for leave?
   你如何解释你不请假而长期缺课的行为？
2. The Students'" in school "statuses refer to students 'daily activities are in the prescribed region of campus, and long absence from school without asking for leave.
   学生的在校就是指学生的日常活动是在学校规定的范围之内，不会出现较长时间的不假离校。

noun

1. unauthorized military absence

   Synonym:    unauthorized absence