牛群在湿地上吃草。Cows were grazing on the marshes.她赶着牛群穿过荒野.She drove the herd of cattle through the wilderness.他精心照料着牛群,不使它们瘦下来.He took care to keep the cattle from falling off....
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...
Haruun Kal is the sole planet of the Al'Har system.哈伦卡尔是阿尔哈星系中唯一的行星.He held a sole tenancy of a flat.他单独租用一套房间。Their sole aim is to destabilize the Indian government.他们唯一的目标就是要破坏印度政府的稳定。The sole survivor of the cras...