The hydroxyl groups can be changed into esters , ethers , acetals and ketals, etc.最常用的羟基保护基可归纳为三类:酯类 、 醚类和缩醛或缩酮类.Eight acetals ( Ketals ) were synthesized under the optimal conditions.在最佳条件下,合成了八个缩醛 ( 酮 ) 化合物.The yields ...
这些货的实际价值大大超过10万元.The actual worth of this parcel is well over $ 100 000.于是在吃饭之前,克拉丽莎跑出去买了一台大大的电子咖啡壶,花了40美元.So Clarissa ran out and bought a large electric coffee maker for $ 40 before the dinner....
“啊，福克斯上尉，”马丁·麦吉尼斯亲切地说，“很高兴再次见到您。”"Ah, Captain Fox," Martin McGuinness said affably. "Nice to see you again."我们的床单有些次，您将就着用吧。We're a bit low on bed linen. You'll have to make do.图尔金拍拍他的肩膀。“不好意思打断您一下，上校。”Turkin t...
Indetermination over truth, as all are texts open to all interpretative perspectives.一切文本都对各种阐释视角开放,而真相永远无法确定.The indetermination brings certain risks to both cooperation parties.不确定性给合作双方带来一定的风险.There are lots of factor...
Conclusion Surgery is very safe and effective for treating bronchiectasis.结论外科手术治疗是支气管扩张症一种安全、效的治疗方法.Lung abscess, empyema and subsequent bronchiectasis are relatively common complications.较常见的合并症有肺脓肿 、 脓胸及随后发生的支气管扩张症.In...