谁能解释下是in which怎么回事?句子还原成一般结构是什么样?

she thinks that any trend in which the temperature increases （by 5 degrees would lead to a catastrophe）括号里面的暂时忽略.
she thinks that any trend in which the temperature increases 恢复成一般结构是：
she thinks that the temperature increases in any trend.

she thinks that any trend would lead to a catastrophe。这是句子的简单形式。
in which the temperature increases by 5 degrees是补语从句，用来说明trend的。
整句意思是她认为温度升高5度这一趋势会导致灾难。
望赞同in which the temperature incr...