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 ...
各家经营各自的农场，收获各自的劳动成果。Each family farms individually and reaps the benefit of its labor.演员们假装从事不同的劳动。Actors go through the motions of different types of labor.土地、劳动和资本都能创造财富。Land, labor and capital are all productive of we...
She could hear the tinny strains of a chamber orchestra.她能听见室内管弦乐队尖细的旋律。Her instructor plugged live bullets into the gun's chamber.她的教练在枪膛里装上了实弹。The members left the council chamber.议员离开了会议厅。...