While urban areas are not short on fiber optic and copper cable, these physical data pipes are sometimes prohibitively expensive and difficult to run to the more remote reaches of the nation.
虽然城市地区不缺乏光纤和铜光缆，但这些物理数据管道有时候极其昂贵，也很难到达国家最偏远的地方。
2
Using a fiber optic cable sensor, the system reports the location of physical disturbances occurring anywhere along the lengths of the sensor, usually attached to a fence or buried underground.
采用光纤电缆传感器，该系统能沿着传感器长度报告所有物理干扰的地点，而且通常都附有围栏或被埋在地下。
3
The second is a novel physical-optic experiments platform based on the LCD and computer generated hologram (CGH) technology.