原文书上写 substituents can be classified into three groups 1. ortho- and para-directing activators:groups like -OH and -NH2 present on a ring direct an electrophile E+ to ortho or para positions and they react faster than benzene 2.ortho- and para-directing deactivators:....省略...they react slower than benzene 3.meta-directing deactivators:....省略....they react slower than benzene 请问这一大段是在讲什麽？？？？？？？？？看不懂... 帮忙解说吧～～～谢谢 -- 林老师 姓林 名奎佑 字伯温 号诸葛 如果吃了你搞的洗脚水 岂不变成D哥亮！ --

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