Keto-enol tautomerism is the most common tautomery phenomenon.Keto -enol themselves are the real chemical substance.
酮及烯醇互变是互变作

通的现象,它们都是真实的化学实体。
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2月合集
3月合集 
考研英语阅读选择真题(英语一) “While we know how to tell a robot to handle a specific error, ” says Dave Lavery, manager of a robotics program at NASA, “we can't yet give a robot enough 'common sense' to reliably interact with a dynamic world.”
“虽然我们知道如何让机器人去纠正一个特定的错误,”NASA的一个机器人项目经理戴维·拉维里说,“我们仍然不能赋予机器人以足够的‘常识’,使它们能够与动态的世界进行可靠的交流。”
级(下) 
研究生考试英语阅读真题
11月合集 
六级听力真题精听
11月合集 There were a hundred and forty-two staircases at Hogwarts: wide, sweeping ones; narrow, rickety ones; some that led somewhere different on a Friday; some with a vanishing step halfway up that you had to remember to jump.
霍格沃茨的楼梯总共有一百四十二处之多。它们有的又宽又大;有的又窄又小,而且摇摇晃晃;有的每逢星期五就通到不同的地方;有些上到半截,一个台阶会突然消失,你得记住在什么地方应当跳过去。