Isoprene could be deeply hydrogenated to isopentane on nickel catalyst.异戊二烯在镍基催化剂作用下可深度加氢为异戊烷.Development proposals of isoprene rubber in China were put forward.结合我国的实际情况,提出了发展我国异戊橡胶的几点看法.Polymerization of isoprene in th...
Development proposals of isoprene rubber in China were put forward.结合我国的实际情况,提出了发展我国异戊橡胶的几点看法.Isoprenoid ( terpene ): Class of organic compounds made up of two or more structural units derived from isoprene.类异戊间二烯化合物(亦称 ...
返回马赛的路上，他们没怎么说话。On their way back to Marseille they spoke very little.飞行员明智地决定尽快返回法恩伯勒。The pilot wisely decided to return to Farnborough post haste.他们驱车返回华灯初上的希灵汉姆时，暮色渐浓。Dusk was deepening as they drove back to the light...
Our teacher rarely condescends to speak with us outside of class.我们老师很少在课堂外屈尊与我们轻松地谈话.He never condescends to any person.他从不谦恭对人.He never condescends to speak to me.他从来未曾屈尊与我谈话....
It must be really depressing listening to everybody's whinges.听每个人的抱怨肯定非常地郁闷。Alice Munro has a reputation for being a very depressing writer.艾丽斯·芒罗以文风沉郁闻名。The rest of the day'sactivities often seemed drab or de...