To measure the difference in elevation between poles, surveyors used an optical level—a telescope on a level base—placed halfway between the poles.

为了测量两极之间的高程差，测量员在两极中间的一个水平基座上使用了光学水准望远镜。

youdao

But this study is the first to experimentally show that optical precursors exist at the single-photon level, and that they are the fastest part of the single-photon wave packet.

而这次的研究则是第一次用实验证明，在单个光子层次上也存在着光前驱，而且它们也是单个光子的波包中最快的部分。

youdao

With optical communications embedded into the processor chips, the prospect of building power-efficient computer systems with performance at the Exaflop level might not be a very distant future.

通过嵌入处理器芯片的光通信，建立Exaflop(1018次，是千万亿次petaflop的1000倍)级水平的高效能计算机系统的愿景将在不太遥远的未来实现。

youdao

These new models feature ATI Radeon HD4670 video cards, a subwoofer, Dolby Surround II capabilities, 16:9 cinema-level displays, and Blue-ray optical drives.

ENGADGET: MSI at CES: Wind U115 / U120, NetOn all-in-one PC, gaming laptops galore

While the entry-level GZ-E320 misses out on the highlight mode, all five models share a 40X optical zoom, 1080p shooting from a BSI CMOS sensor, an SDXC card slot and a 3-inch touchscreen for previewing any would-be masterpieces.

ENGADGET: JVC launches five Everio camcorders in Japan, two with Android remote control

The HC-V520 also makes an appearance with its 50x optical zoom full HD and 5-axis OIS. If you want some 3MOS action with manual ring, EVF and level gauge action then the HC-X920 is the one for you.

ENGADGET