110 is an alarm system, it can be used when you are in dangerous or in case of emergency. So it's necessary to remember this telephone number and learn how to use the system. After putting through 110, you will firstly hear such a prompt in both Chinese and English: "Hello, here is 110 alarm service", then an operator will hear your case. Please answer the questions according to the requirements of the operator, such as your name, position and contact ways and so on as well as the basic information of the case alarmed. Generally, you should remain at the position where you give the alarm to wait for policemen and contact with them as soon as they arrive. Please keep the site untouched so that the policemen can acquire evidences at the site. If you put through 110 by mistake, please hang up immediately