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用最普通
现象,它们都是真实
化学实体。
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(英语一) 
Amazon has just announced the purchase of the upmarket grocery chain Whole Foods for $13.5bn, but two years ago Facebook paid even more than that to acquire the WhatsApp messaging service, which doesn't have any physical product at all.
马逊公司刚刚宣布以135亿美元收购了高档杂
连锁店 “全食超市”,而就在两年前,脸书以更高
价格收购了 WhatsApp 信息服务,该服务没有任何实
产品。

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