"Mum thinks I should stop imposing on your hospitality, Leo," said Grace.“利奥，我妈妈觉得我不应该再在这儿麻烦你了，”格雷丝说。A few of us in the press were there, goggle-eyed at the lavish hospitality.我们几位记者当时在那里，眼馋地看着丰盛的茶点。We will always rememb...
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 ...