She had an impeccable aristocratic pedigree.她有纯正的贵族血统。She had impeccable taste in clothes...她的穿衣品位无可挑剔。He has an impeccable sense of timing...他有着无可挑剔的节奏感。He dressed well and had impeccable manners.他衣冠楚楚，待人接物无可挑剔。Her acad...
If such materials became generally available to the optics industry the payoffs from such a breakthrough would be enormous.如果这些材料能够普遍用于光学产业，那么这一突破带来的收益将非常巨大。This part of the subject is called physical optics.这部分内容叫做物理光学....