简要介绍以此类方法对合成苯甲醛的研究.Based on the reactions , this paper reports research for synthesizing benzaldehyde.再溴代得到2-溴 -4,5-二甲氧基苯甲醛,收率为91.9%,并分析溴代过程中甲酰基的邻位效应及溴代产物的稳定性.This product with Br 2 was obtained 2 - bromo - 4,5 - hydroxy...
这条道越过瓦尔山口之后，穿过于拜河畔圣保罗。After going over the Col de Vars, the route passes through St-Paul-sur-Ubaye.我们匆匆穿过湍急的那曲河畔这个毫无生气的小镇。We hurried through the colourless little town set on the fast-flowing Nyakchu.他拜访了住在河畔避暑别墅的亲戚。He v...
Then something seemed to snap in me. I couldn't endure any more.这时候，我的心里像有个东西突然绷断了——我再也忍受不了啦。He had to endure the racist taunts of the crowd.他不得不忍受那群人种族歧视的奚落.It is better to die of repletion than to endure hunger.饱死...
Many of the refugee villages are in isolated areas.很多难民村落都在偏远地区。Refugee workers said such action was a violation of medical ethics.难民工作者说那种行为是对医德的亵渎。Overcrowding and poor sanitary conditions led to disease in the refugee...