Sodium ethylate was used as catalyst in Baker - Venkataraman of cyclization, and all factors were studied.环合反应采用乙醇钠作为Baker-Venkataraman重排反应的催化剂, 研究了影响反应的各个因素....
He harked back to the subject.他回到了本题.She often harked back to her days in the countryside.她时常谈到在乡下度过的那些日子.The hounds harked back to the dells.猎犬折回小山谷想再找寻到嗅迹.We harked the hound back.我们唤回猎犬....
...the site where Stephenson sank his first mineshaft...斯蒂芬森挖掘第一口竖井的地方For years he refused to associate with Stephenson's staff.多年来,他一直拒绝同史蒂芬森手下的人交往.The reader is referred to Stephenson for a full treatment of this ...
鸿 渐 只担心自己要生盲肠炎.Hung - chien was worried lest he get appendicitis.严重的胃痛可能是盲肠炎的征兆.Severe stomach pain could be a sign of appendicitis.我小时候动过盲肠炎手术.When I was a child , I had an operation for appendicitis....