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....
Once at Elgin day-trippers visit a number of local sights.一到达埃尔金，一日游的游客就参观了一些当地的风景名胜。Among the most spectacular sights are the great sea-bird colonies.庞大的海鸟群是最壮观的景象之一。We just do not set our sights high enough.我们设定的目标不够高远...
His forehead knotted in a frown.他眉头紧锁。Objective : To remove glabellar frown lines and crows lines using brow lift which improve beautify face.目的: 利用抬眉术切口,去除眉间皱纹及鱼尾纹,提高面部年青化手术效果.A frown formed between her arched brows.她皱起...