由二苯并-1,3-二氧杂 - 环辛烷 -2- 羧酸经两步反应制得, 总收率70%.It was prepared by the reaction of 12 H - dibenzo [ d , g ] [ 1,3 ] dioxocin - 6 - carboxylic acid with acetoxime....
The doctor knew that the wounded soldier's life was despaired of.医生知道那伤兵的生命已经无望.Most scientists despaired of ever knowing the physical nature of the stars.大多数科学对了解恒星的物理性质失去了信心.She stood at the corner of Main Street ...
One by one they came forward, mumbled grudging words of welcome, made awkward obeisances.他们挨个儿走上前去，勉强地咕哝出几句欢迎词，生硬地鞠躬致礼。After two or three minutes, he paid his obeisances again and left.两、三分钟后他再次敬礼,然后走了....