戴双焦眼镜的人知道往地下看的时候怎么是看到歪曲的景象。
People who wear bifocal glasses know all about how the distorted view they get when looking downwards at the ground.
电子眼镜一个新的部分是enPower，允许双焦眼镜对看书和更远景观的不同指令调节点进行转换。
Part of a new line of electronic eye glasses called emPower, they allow bifocal wearers to switch between different prescription settings for reading and more distant viewing.
记录和分析了高功率激光焊接中工作区的紫外和红外信号，着重分析了双波段信号与离焦量变化的对应规律。
Dual waveband signals in high power laser welding were recorded and analyzed, especially, the law between the signals magnitude and the defocusing was discussed.
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