美国加州国家实验室的科学家,运用高科技手段,研制成功一种可发现和阻挡子弹的“卫兵”系统,能保证拥有这一系统的人的绝对安全。高科技的“卫兵”系统,是由一个红外线传感器、一台摄像机和一台电脑组成。它能在对方子弹射出枪口的几米之后,发现飞行中的子 Scientists at the California National Laboratory in the United States have used high-tech means to develop a “guard” system that discovers and blocks bullets, ensuring the absolute safety of people who own the system. The high-tech “Guard” system consists of an infrared sensor, a video camera and a computer. It can find the flying child a few meters after the other bullet has fired a muzzle