很多环戊烷的衍生物在这个范围也出现吸收.Many cyclopentane derivatives also absorb in this region.后者是由二氧杂环戊烷中活化较弱的C -H 键离解而产生的.The latter arises from abstraction of the somewhat lesser activated C - H bond in the dioxolane.控制缩合反应的温度,还得到一种苯并环...
He cancelled many unnecessary words in his manuscript.他把原稿上许多多余的词删掉。...cancelled stamps.盖销（邮）票In recasting, the experiences of all ancestors are cancelled out founded upon extreme opposites.在重铸中, 所有祖先的经历将根据相对极性被彼此中和取消.Th...
I just had a quick scan through your book again.我只是又快速浏览了一遍你的书。He was rushed to hospital for a brain scan.他被火速送往医院做脑部扫描。A brain scan last Friday finally set his mind at rest.上周五的脑部扫描终于让他放心了。...