The alchemists were the forerunners of the scientists of today.炼金术士是今日科学家的先驱.Medieval alchemists attempted to transmute base metals into gold.中世纪的炼丹术士企图把贱金属炼成金.The alchemists were unable to accept the inconvertible natur...
R ” 是取化基,如乙氧基 、 甲氧基及它们的环氧和烷氧同系物或卤基.R " is a replaceable function , e . g . acetoxy, methoxy, their acyloxy and alkoxy homologs or halo.通过选择特定的同系物混合物, 可以达到应用性能的优化.By selection of specific homologous mixtures, application ...
Rotary's primary responsibilities include fundraising, advocacy, and volunteer recruitment.扶轮主要的责任包括了募款 、 倡导和招募义工.Active & negative factor of indebted management, and keeping away of fundraising risk.负债经营对企业的积极 和 消极...
有时他会倒嚼我们喂给他吃的食物，因为他无法吞咽。Sometimes he regurgitates the food we give him because he cannot swallow.手术后你咀嚼和吞咽都会感到困难。After the operation you may find it difficult to chew and swallow.什么食物都要先嚼碎再吞咽。Always chew food well before...