Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act

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问题 Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act more effectively in cognitive areas such as attention and memory.

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答案研究学者已经证实,当人们用脑时,大脑中会发生生化反应,使其在注意力和记忆力这样的认知领域运作效率更高。

解析 句子主干:Researchers have established that…;第一个that引导宾语从句,其中when引导时间状语从句;第二个that引导定语从句修饰changes,it指代brain。
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