根据句意可知,安全问题已经引起了学校的高度重视,因为经常有关于学生在校被杀或者受伤的事故被报道.
学生在校被杀或者受伤的事故
先行词是 accidents,后面是一个定语从句来修饰是怎样的事故,根据中文可知,是学生在这个事故当中被杀或者受伤,也就是 students got injured or killed in the accidents.
现在which来代替accidents.in which 也就是相当于 in the accidents.
about accidents in which students got injured or killed
一般常见的 表示地点时 in/ on/by which=where
表示时间时 in /at/ on which=when
表示原因 for which=why
一般用why的时候,先行词是the reason
This is the reason why he was late
This is the reason for which he was late