Researchers have established that when people are mentally,b

来源：学生作业帮编辑：百度作业网作业帮分类：英语作业时间：2024/05/02 02:52:39

Researchers have established that when people are mentally,bio-chemical changes occur in the brain
请问这个句子中brain后的that属于句子的那个成分,还有其后的指代词it 指代的是什么,这个句子该怎么分析成分,谢谢!
Researchers have established that when people are mentally engaged，bio-chemical changes occur in the brain that allow it to act more effeetively in cognitive（认知的）areas such as attention and memory. 不好意思刚才句子不完整，请大家帮我分析一下，谢谢！

研究者们已经确定：当人们精神上(此处少了东西,应该是个形容词),头脑中就会发生生化变化.
Researchers have established that （引导宾语从句,后边全部是宾语从句部分）when people are mentally（是不是漏了什么词,这半句是宾语从句里的状语成分）,bio-chemical changes occur in the brain （宾语从句的主干部分）
另外：没有见到您说的it啊

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