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%.
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...
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. "...
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....