主反射镜焦点 porime focus
双焦点眼镜 Bifocal eyeglasses ; bifocal glasses ; bifocal spectacles ; divided spectacles
双焦点透镜 bifocal lens
双焦点镜片 ultex ; bifocal lens
三焦点镜片 trifocal lens ; trifocal l lens
多焦点透镜 multifocal lens ; ultifocus lens
透镜的焦点 focus of lens
多焦点眼镜 multifocal spectacles ; multifocal comedys
三焦点透镜 trifocal
整块双焦点镜 ultex
争议的焦点是30米望远镜所在冒纳凯阿火山计划的选址，该休眠火山被一些夏威夷人供奉为脐带，将夏威夷岛屿和天堂连接在一起。
At issue is the TMT's planned location on Mauna Kea, a dormant volcano worshiped by some Hawaiians as the piko that connects the Hawaiian Islands to the heavens.
星火的回答是：射出去6英里远的激光到大气中间层，测量失真，然后调整激光的反射镜直到光束背对焦点。
Starfire’s answer: Shoot a laser 56 miles into themesosphere and measure the distortion. Then adjust the laser’smirrors until the beam is back in focus.
太阳弯曲来自遥远星球的光线到一个焦点。 那个焦点可能有一百万倍的放大能力，使最大功率的望远镜相形见绌。
The Sun bent light from distant stars to a focal point where one million-fold magnifications should be possible, dwarfing the abilities of the most powerful telescopes.
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