The conductor blew his whistle, and the tram stopped.售票员吹哨子, 电车停了下来.Freda: What can you see a tram or a double - decker ?弗蕾达: 你可以看到有轨电车或 双层?In 1882, London's first electric tram cars went into service...1882 年，伦敦第一辆...
以氟化钾为催化剂, 催化十二烯基琥珀酸酐(DDSA)缩合成螺双内酯化合物.With potassium fluoride as catalyst, spironolactone compound was synthesized from DDSA.研究了双环戊二烯基铁作为燃料添加剂的应用.The application of ferrocene as fuel additive is studied.为此, 我们开展了对含环戊二烯基二硫...
a cautionary tale about the problems of buying a computer有关购买计算机时可能遇到种种问题的告诫Barely fifteen months later, it has become a cautionary tale of the pitfalls of international mergers and acquisitions.不过15个月，它就成了告诫人们留心跨国并购中陷阱的...