The infra - red spectra of quinones present a number of interesting features.醌类的红外光谱具有一些有趣的性质.Ethylene and trans - dichloroethylene are both inactive in the infra - red in this region.乙烯和反式二氯乙烯在红外光谱的这个区域都无活性.Infra - red ...
动作夸张而华美, 有唱段也有宣叙部.The actions are large and colour , there are arias and recitatives.这个唱段中的拖腔特别多.There are a lot of long , drawn - out tunes in this aria.这个唱段要求用小嗓演唱.This part of the opera needs to be sung by female play...
He came insolently towards Mr. Won, his features set in a scowl.他傲慢无礼地朝元先生冲过来，面露怒容。He looked up at me with a scowl.他脸色阴沉，抬眼看了看我。He wore a permanent scowl on his face.他脸上终日带着怒容....
Things might have been different if I'd talked a bit more.如果当时我再多说一点的话，结果或许会不一样。He cracked jokes and talked about beer and girls.他爱说笑话，喜欢谈论啤酒和姑娘。As he talked, an airforce jet screamed over the town.他谈话时，一架军用喷气式飞机在镇子...