Through nitrosation , hydrogenate reducion, and acylate three steps, the yield surpass 80 % for the diethyl malonate.收率相对于丙二酸二乙酯达到了80%以上.The necessary material of 2 - ( 2 - methoethyl ) acetaldehyde diethyl acetal was sy...
Altair is not as bright as Vega and Deneb.牛郎星不如织女星和天津四明亮.While more 3 stars, called the Altair.一边多了三颗星, 叫做牛郎星.Altair is as bright as Vega and Deneb.牵牛星与织女和天津四相比,光亮度还是略为逊色....
Interest is paid monthly. Three months' notice is required for withdrawals.利息按月支付。提款须提前3个月通知银行。Sandra was determined to become a doctor and her persistence paid off.桑德拉决心成为医生，她的坚持取得了成功。He paid for and was assigned a...
在湖中游了一会儿泳后,约翰感到精神振奋.John felt refreshed after a quick plunge in the lake.船划到了中游.The boat pulled out into midstream.我们经常把一条河分成三部分:上游 、 中游和下游.We often divide a river into three parts, that is the upper, middle and lower re...
她走到凉快的走廊上。She walked into the cool of the hallway.拉尔夫硬爬上平台, 一下子就注意到了这儿凉快的绿荫.Ralph hauled himself on to this platform, noted the coolness and shade.把你的手按在我的额头上, 让我感觉到你的凉快的手的触摸.Place your hand upon my brow; let me feel you...
我耽搁了些时候——家里出了点事。I was delayed — something came up at home.他讨厌任何形式的拖延和耽搁。He hates delay and procrastination in all its forms.这些法律导致了困惑、混乱和数年的耽搁。The laws led to confusion, muddle and years of delay....