The extraction of penicillin G with petroleum sulphoxide and di - isooctyl.系统研究了亚砜类萃取剂石油亚砜和二异辛基亚砜萃取青霉素G的性能.A gas chromatography method for the quantitative analysis of isooctyl acid was introduced in this paper.摘要建立了异辛酸合...
Don't be too downhearted. There's always a way.别太悲观了，总有办法的。Max sighed, sounding even more downhearted.马克斯叹了口气，听上去更沮丧了。We're disappointed by these results but we're not downhearted.我们对结果感到失望，但是并未丧失信心。T...
The trip had been unforgettable experience for both of us.那趟旅行是我们两人难以忘怀的经历。Bergman and Bogart were unforgettable.褒曼和鲍嘉令世人难忘.I have an emotional heart, it is sentimentally attached to you unforgettable.我心中有一份情感, 那是对你刻骨铭心的...
I shall soon pay the last instalment of my debt.不久我将偿付我的最后一期债款。...the disappointing third instalment of the Highlander series.“挑战者”系列令人失望的第三部Did you hear the final instalment last week?上星期你有没有听最后一集?...the first month...