In addition, NIST has shown that extremely stable microwave signals can be generated from optical frequency combs.

另外，NIST还发现可以从光学频率梳产生非常稳定的微波信号。

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Looking toward the grand southern constellation Centaurus, both views reveal stars and structures hidden from optical telescopes by obscuring dust.

往壮丽的南天星座半人马座方向看，两种图都显示出隐藏在尘埃后面光学望远镜看不见的恒星和结构。

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Such telescopes are called reflectors, and they offer major advantages over refractors, which use two lenses and suffer from optical distortion effects.

这种类型的望远镜称为反射望远镜，比折射望远镜更具有优势，后者需要用到两个透镜，而且会受到光学畸变效应的影响。

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The group is trading sharply lower following disappointing guidance this morning from optical networking component provider Ciena (CIEN).

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They were only minor players in these erstwhile American-led industries in the 1980s but are now dominant in everything from optical fibers to smartphone components, not to mention virtually every serious manufacturing challenge in the aerospace industry.

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The 41-year-old sales account manager headed home from an optical supply business in Ronkonkoma around 4 p.m.

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