Isomerization occur during bromine reaction, that is mean secondary allylic configuration changes into primary allylic configuration. 在溴化反应过程中存在分子结构重排, 即溴代仲位烯丙基构型向溴代伯位烯丙基构型发生转化.
I shall persuade him to take the painkiller.我将说服他把药吃下去.You can pre-empt pain by taking a painkiller at the first warning sign.刚出现征兆时，就服用止痛片来预防疼痛。Yet Gerard received no relief except for ibuprofen, a mild painkiller.然而Ger...
They sat aside 100 channels, each 200 kilohertz wide.他们在旁边坐了100种渠道, 各200千赫宽.Twisted - pair conductors are sufficient if frequencies of interest are below a few hundred kilohertz.如果信号频率低于几百kHz,则使用双绞线就已足够....
I dozed off during the soporific music.我听到这催人入睡的音乐,便不知不觉打起盹儿来了.The warmth of the room and the monotony of the speaker's voice grew soporific.房间里的热气和发言人单调的声音让人昏昏欲睡。After trudging for some distance, his slow steady st...
你脸上的抓痕是怎么来的?How did you come by that scratch on your cheek?小偷带着浑身的抓痕和青肿逃之夭夭.The thief got away , but not without some scratches and bruises.他脸上有道深深的抓痕.He has a deep scratch on his face....
His wrist was sprained.他的手腕扭伤了。I stumbled and sprained my ankle.我摔了一跤，把脚脖子扭了。When Mary sprained her ankles, John carried her piggyback to the doctors.玛丽扭伤了足踝, 约翰驮她去看医生....