In Kansas, Missouri, a computer helps firefighter. The computer contains information about everyone of the 350,000 street addresses in the city. When a firefighter answers a call, the computer gives him important information about the burning building. The computer can give the location of the building and its size, type and content.In fact, the computer system has almost unlimited ways of helping firefighters with their problems. For example, it can give medical information about invalids (伤病者) living in a burning building.The speed of a computer is amazing. Within 2 or 3 seconds after a call is received, the computer provides necessary information for the firefighters. The information is then sent to them by the radio from the computer center in the city hall. The Kansas City Computer System also contains a medical record of each of the city’s 900 firefighters. This kind of information is especially useful when a firefighter is injured. With this medical information doctors of a hospital can treat the injured firefighters more quickly and easily. The firefighters themselves greatly appreciate the help of the computer. They know about possible dangers ahead of them and can prepare for them. Many times the computer information helps to save lives and property, and sometimes the lives are those of the firefighters themselves.Question:In what way does the computer system greatly help firefighters?