区别是:
at school比较常用,指在学校,包括抽象的动作,比如学习。
at a school不常用,而且比较具体,在一个学校里面,强调地点。
例句辨析:
at school
1、He was disciplined at school for talking back to the teacher.
他因为和教师顶嘴受到了处分。
2、Each child had participated in extracurricular activities at school.
每个孩子都参加了学校的课外活动。
3、Is the child at school?
这孩子上学了吗?
at a school
1、Neil had been at a prize giving ceremony at a school in Birmingham.
尼尔之前在
伯明翰的一所学校参加颁奖仪式。
2、The telephone rings in the principal's office at a school.
校长办公室里的电话铃响了起来。
3、Did you hear about the fire at a school in Britain last week?
你听说到上周英国的一所学校着火的事了吗?