The basic concept behind high-definition television is actually not to increase the definition per unit area… but rather to increase the percentage of the visual field contained by the image.
高清晰度电视的基本概念实际上并不是提高每个单元域的清晰度，而更多是提高图像中包括的可视域的百分比。
Developed for field use in military environments, the unit provides a visual or audible alarm when a threat is detected and classifies the agent by threat category.
开发供在军事环境中实地使用，当威胁被检测到且按威胁种类分类后该设备提供了一个视觉或听觉报警。
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