The diisobutyl dicarboxylate was prepared by using acid and isobutanol as material and acid as catalyst.以二羧酸和异丁醇为原料,用硫酸作催化剂,合成二羧酸二异丁酯.Butyl cinnamate was synthesized from cinnamic acid and butyl alcohol using tungstosili...
Acid rain is not straightforwardly attributable to the burning of coal.酸雨并非简单地由烧煤造成。Nor is acid rain always, and universally, a bad thing.酸雨也并非在任何情况下都是坏事。This comedy of contemporary manners is told with compassion and ac...
她情绪多变，时而咄咄逼人，时而又显得温柔平和或乐于合作。Her aggressive moods alternated with gentle or more co-operative states.他的语气时而透着愤怒，时而流露出哀怨。His tone was by turns angry and aggrieved.他因不守时而受到处罚。He was penalized for bad timekeeping....
Self-consciously she fingered the emeralds at her throat.她局促不安地摸抚着脖子上的绿宝石。He fingered the few coins in his pocket.他拨弄着口袋里的几枚硬币。He fingered his jaw thoughtfully.他若有所思地摸着下巴....
ICM is an internationally patented call waiting service suited to the domestic market.因特网呼叫管理（ICM）是一项获得国际专利的、适合国内市场需求的呼叫等待服务。Do you have call waiting?你有插拨服务 吗 ?Was that call waiting or did a vein pop?那是再给次机会还是一次了结了?...