Volume holographic imaging (VHI) systems incorporate a volume hologram as one of the optical field processing elements in the system.

体全息成像系统是结合一个作为光学场处理的体全息组件的成像系统。

Through its Vision Health Initiative (VHI) and diverse stakeholders, CDC commenced the development of a coordinated national public health framework to prevent vision impairment and blindness.

通过它的视觉健康倡议（ VHI ）和不同的好处相干者，疾病预防和把持中心开端构建一个和谐的国度公共健康的框架，以防止视力侵害和盲症。