The carbon is electrophilic centre.碳是亲电的中心.It will become deepen to the students'recognization in mechanism of Aryl electrophilic substitution.这些问题的讨论将深化学生对芳烃亲电取代反应机理的认识.The rate constants of radical and electrophil...
Workmen were hired to remodel and enlarge the farm buildings.雇用了工人来改造和扩建农场建筑。In University Square workmen are building a steel fence.在大学广场上，工人们正在修建钢栅栏。The coarseness of her cursing amazed the workmen.她骂人的那些粗话让工人们大吃一惊。...
the Nevada-California state line内华达和加利福尼亚两州州界The film begins with an aerial view of the Great Basin of Nevada.影片以空中鸟瞰内华达大盆地的镜头开始。To her surprise, Kay came to love living in Nevada.恺喜欢住在内华达州,连她自己也感到奇怪....