Most direct substitution of groups bound to an aromatic nucleus is limited to diazonium salts.大多数连于芳核能被直接取代的基团仅限于重氮盐.Severe steric effects at the reactive carbon would impede the substitution.大的立体效应阻止在碳上的取代.We use saccha...
It is the preparation to make exercise, chasten will.锻炼身体,强壮体魄, 磨练意志也是准备.chasten a careless writing style.使随便草率的文风变得简洁朴实For tomorrow's success, chasten ourselves today.为了明天的成就, 今天就磨练自己.——张沁.chasten a proud spirit.抑制...
She displayed great ardor for art.她对艺术表现出极大的热心.His political ardor led him into many arguments.他的政治狂热使他多次卷入争论中.They evoke no ardor in the male breast.它激不起男人胸中的热情....
There is a vocabulary at the back of our English book.我们英语课本的后面附有词汇表.My English book is on the top shelf.我的英语书在最上边一层架子上.An English book is a blank to me.我对英语书一窍不通....
Seesaw structure of subsurface temperature anomalies between the Barents Sea and the Labrador Sea.在Barents海和Labrador海之间近地面温度异常的跷跷板结构.Crystal, a year - old black Labrador - Dalmatian mix, peers through a - shaped hole in ...