be engaged in w_

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• 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！
• Don't w_ .I can help you.
• 求：谁能讲下面这段英文文章翻译成中文,要翻译的完整点哦,谢谢啦~~（注：谷歌上面的翻译The field of air resources raises my special attention, since air is an important part of our daily life. We human beings have pumped large sums of time and effeort into mangaing and protecting air resources. In the United Nations Climate Change Conference at Copenhagen, Representatives of each country engaged in heated discussion that how to reduce the Carbon emissions. It is well known that if we cannot act
• 1.what tv programmes do you like?i like w_ programmes about animals.2.your room is a_ sorry.i'll1.what tv programmes do you like?i like w_ programmes about animals.2.your room is a_sorry.i'll clean it up immediately
• on w_ he gets up early ,but at w_ he gets up late
• 帮我做个选择题：I came to changsha in 1999（ ）I have been engaged in this work
• He likes play w_ with his friends.
• What are you w_ _ d _ _
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• how is her mother noe ,she is very w_
• 翻译“it's supposed to be loud.”
• engage in在这句话里怎么翻啊?