甲烷和丙烷是烷烃。Methane and propane are alkanes.丙烷气钢瓶a propane gas cylinder亚胺基杂环丙烷季铵盐的阳离子,一定是按协同反应的方式开环的.The aziridinium ions must all be opened by a concerted process....
电影业故意无视电视业的侵犯性竞争。The movie industry had chosen to ignore the encroaching competition of television.这是我投身电视业的初始阶段。That was the beginning of my life in the television business.当前电视业的竞争残酷无情。The TV business today is a dog-ea...
He was replaced by Lt Frank Fraser.他被弗兰克·弗雷泽中尉顶替。George Fraser was clearly a good soldier, calm and resilient...乔治·弗雷泽显然是个好士兵，沉着冷静且适应力强。Lord Fraser's speech offers much food for thought...弗雷泽勋爵的讲演发人深省。Fraser did not...
1875年,来自东部的拓荒者在这个地区定居下来.Pioneers from the East settled in this region in 1875.约翰. 肯尼迪为新拓荒者精神的典型人物.John F . Kennedy typified the new frontier spirit.《拓荒者》引出了库珀笔下最有名的两个人物.The Pioneers introduced Coopers two best - known cr...