There are two kinds of twins in Berlinite: electric twin and optical twin.

磷酸铝晶体中存在两类双晶：电双晶和光双晶。

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There are two kinds of twins in Berlinite:electric twin and optical twin.

磷酸铝晶体中存在两类双晶：电双晶和光双晶。

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Regarding groundbased observation , the largest optical telescopes to date are the twin 10 - m keck telescopes on mauna kea of hawaii.

位于夏威夷蒙那基亚山上的却克望远镜，口径达10米，是目前世上最大的光学望远镜。

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An Israeli company, dubbed Lumus-Optical, is looking to change all that by offering up a relatively normal looking set of spectacles with twin microdisplays and mini projectors.

ENGADGET: Lumus-Optical unveils microdisplay-packin' designer glasses