看看这个英文句子有没有语法错误?

题目

看看这个英文句子有没有语法错误?
"Rocket reaserch has confirmed a strange fact which had already been suspected there is a high temperature belt in the atmosphere, which's center is roughly thirty miles above the ground"有没有语法错误?
引导同位语从句时的that是否可省?

答案

Rocket reaserch has confirmed a strange fact which had already been suspected that there is a high temperature belt in the atmosphere,of which the center is roughly thirty miles above the ground