四级Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act more effectively in cognitive (认知的) areas such as attention and memory.
研究人员已经证实,当人们在精神上投入时,大脑会发生生化变化,从而使其能够更有效地进行认知活动(认知的) 注意力和记忆等领域。
1995年6月大学英语四级(CET-4)真题
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