This article introduced a method for preparing α - chloro - isobutylaldehyde , in order to explore a practical chloration of oxo - compound. 本文介绍了制备氯代异丁醛的方法, 其目的在于探索羰基化合物的一种实用的氯代方法.
The London City Ballet has engaged two male dancers from the Bolshoi.伦敦市芭蕾舞团从波修瓦芭蕾舞团聘来了两名男舞蹈演员。I have a large circle of friends and acquaintances engaged in photography.我在摄影界交游甚广。At least 17 different irregular units are...
航图是专门用于导航的一种地图.Charts are a map adapted specially for navigation.本文提出了一种用于车辆导航的地图匹配算法.An improvement of map matching method for vehicle navigation system is presented.星间测距是重力测量卫星和卫星自主导航的关键技术.Inter - satellite ranging is ...
The American and Japanese navies took the lead in the development of naval aviation...美国和日本海军是发展海军航空部队的佼佼者。The Wright brothers pioneered in early aviation.莱特兄弟是早期航空的先驱.The Gossamer Conder, a human - powered airplane, fle...