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....
...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....
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....