句中-one in which语法上如何理解

题目

句中-one in which语法上如何理解
This mass murder was planned by Osama bin Laden and his al Qaeda network in Afghanistan,and signaled a new threat to our security – one in which the targets were no longer soldiers on a battlefield,but innocent men,women and children going about their daily lives.

答案

one是前面a new threat的同位语,后面in which引导定语从句修饰one.再举两个类似的例子：This is a world of wonders,one where everything can happen.(one是a world的同位语）Seeing my uncle after so many years ...