P - methoxybenzeneacetonitrile was prepared in 34.8 % yield starting from anisole, via chloromethylation, cyanogenation and fractional distillation. 以苯甲醚为原料,经过氯甲基化, 氰化反应后, 通过精馏获得对甲氧基苯乙腈,总收率为34.8%.
She has been reliable and punctual.她一直可靠守时。I have to go now because I must be punctual for class.我现在不得不走了,因为我得准时去上课.He stressed the point that we should be punctual.他强调的一点是我们必须准时....
发出一阵赞赏的低笑声。There is a murmur of appreciative laughter.他瞧出我用赞赏的目光看着他的汽车.He saw me looking with admiration at his car.老头用赞赏的神气看着它, “ 这只狗要十美元. ”He looked at it admiringly. " That dog will cost you ten dollars. "...
这台仪器可以辨别癌细胞和正常的细胞。The device can discriminate between the cancerous and the normal cells.孩子开始时不太能辨别语言中的差别。The child'll start out by making relatively few distinctions in the language.这两个品种很难辨别。It's difficult to...