其金属取代物能和环戊酮顺利地反应得到40.Its metallation and addition to cyclopentanone proceeded well to 40.以单质碘为催化剂合成了环戊酮乙二缩酮.Cyclopentanone ethylene ketal was synthesized with I _ 2 as catalyst.比较研究了三种含苄叉环戊酮基团的新型香豆素类光敏染料.Absorption spect...
Items marked with an asterisk can be omitted.打星号的项目可以删去。The asterisk refers the reader to a footnote.星号是让读者参看脚注.The asterisk refers to a footnote.星号表示参看附注....
她在独奏会上首先演出的是海顿的奏鸣曲.Her recital led off / She led off her recital with a Haydn sonata.莫扎特在风格上与海顿截然不同.Mozart's style is quite distinct from Haydn's.自那以后, 海顿人向我们分享了许多他们的技术.Since then, the Haydonites have shared mu...
The island's rodent population irrupted.这座岛屿上的啮齿类动物急剧繁殖.She irrupted into our sitting room.她突然闯进我们的客厅.The crowd irrupted into a burst of patriotism.人群中爆发出一片爱国主义声音....
他的歌旋律优美、悦耳动听，让我潸然泪下。Wonderfully melodic and tuneful, his songs have made me weep.沃森的嗓音美妙，高音嘹亮动听。Watson has a wonderful voice, with thrillingly clear top notes.从小到大，生活在我周围的人都有着悦耳动听的嗓音。I grew up around people who had wonde...
The evanescent post - war economic boom was quickly followed by a deep recession.大萧条紧随短暂的战后经济繁荣而来.All was unstable; quivering as leaves, evanescent as lightning.一切都是不稳定的, 都象树叶似地颤动翻转,象闪电似地倏忽明灭.By epiphany he means'th...
A slight breeze rose, wafting the heavy scent of flowers past her.清风吹拂，浓郁的花香向她飘来。But that gentle fragrance was clearly wafting from the window.但那股淡淡的香气,却分明是从母亲的窗户溢出的.With the accompany of snowflakes, you feel your heart ...
Yard sale shopper Larry Sutton pauses with purchases in Trenton , Ga.乔治亚州特伦顿市场的一位摊主在摊位旁稍作休息.That is what is great about shopping at a community yard sale.没错,在这种社区卖旧货的地方真能买到便宜货.There are a lot of foreign shoe stores have ...