Medicine intermediate N - ethylethylenediamine ( NEED ) was synthesized from acrylamide and ethylamine by addition reaction and Hofmann rearrangement.以丙烯酰胺为起始原料,经乙胺加成后,再经Hofmann重排两步反应后合成了药物中间体N - 乙基乙二胺 ( NEED )....
她用装饰性的薄纱遮住了脸。She swathes her face in a veil of decorative muslin.温斯顿透过薄纱窗帘,心不在焉地盯着窗外.Winston gazed abstractedly through the muslin curtain.那可爱的小姑娘打扮得很漂亮,穿着柔软白净的薄纱衫.The little creature was daintily decked out in soft, sno...
President Mitterrand, 75, has been given a clean bill of health by doctors in Paris.巴黎的医生们告诉75岁的密特朗总统，他的身体非常健康。President Mitterrand arrived in Hanoi yesterday to bury old colonial and cold war enmities.密特朗总统昨天到达河内，以期结束长久...
Giuseppe Rossi will not be joining West Bromwich Albion on loan.罗西新赛季将不会以租借的形式加盟西布朗维奇.She sat on Rossi's knee as he whispered in her ear...她坐在罗西的膝盖上，听他低声耳语。Rossi spat very deliberately, and very messily , upon Durie...
Serpentine often contains some asbestos , and should be used with caution .因为蛇纹石往往包含了一些石棉，收集时应谨慎。They claim the council has prejudiced their health by failing to deal with asbestos.他们声称，理事会没有处理好石棉的问题，从而损害了他们的健康。The prosp...