Your son has had too many absences from school.你儿子不上学的次数太多了。I wrote an excuse for my absence from school.我写了一张请假条，说明缺课的原因。He could not account for his absence from school.他无法说清楚为什么旷课。He tried to explain his absence from school to his mother.他试图跟妈妈解释自己没有上学的原因。