他对音乐几乎一窍不通，却预感到它将会大受欢迎。He knew virtually nothing about music but he could smell a hit.他的胜利因为一种令人不安的不祥预感蒙上了阴影。His triumph was overshadowed by an uneasy sense of foreboding.我预感他会给我带来危险。I had a presentiment that he represen...
溴化氢加成的最后一步,是负离子亲核试剂的附加.The addition of hydrogen bromide involves the attachment of an anionic nucleophile in the final step.关于加成的定向问题,可以一直追溯到自由基化学的起源.The problem of orientation of addition goes right back to the beginnin...