两者通过普通的分馏彼此分离.It can be separated from each other by ordinary fractional distillation.气体分馏 - 间歇式聚丙烯联合装置中一些气体的排放会造成很大的浪费和环境污染.The gases light - ends unit may cause serious waste and environment pollution.分馏法只属物理方法,不能分解化合物...
由四英里长的城墙围着的设防城镇a fortress town enclosed by four miles of ramparts对来自空中的攻击是无法设防的.There can be no real defence against attacks from the air.他们不能让这座城市不设防.They could not leave the city unguarded....
Usumbura was renamed Bujumbura when Burundi became independent in 1962.布隆迪年独立后乌松布拉改名为布琼布拉.Sierra Leone and Burundi have been designated as the first two beneficiaries.塞拉里昂与布隆迪被选定为最先两个受益国.South Africa, for instance is muc...
磺胺药物对一些可怕的疾病,如猩红热和麻疯病,都有良好的疗效.Dreaded diseases like scarlet fever and leprosy responded to the sulfas.在中国,乳香被认为是用作治疗麻疯病.In China frankincense was thought to be a treatment for leprosy.麻疯病是一种影响皮肤和神经的疾病.Leprosy is a kind o...