Tokyo(东京) is one of the most confusing cities in the world. Over 20 million people live and work in the Tokyo area, and many world-famous companies have their offices there. But most streets don't have names. So how can you find your way in Tokyo? Most people in Tokyo are very good at giving directions. They can usually explain how to get to their home or their office from the nearest train station. People in Tokyo often use maps when they give directions. Advertisements in newspapers or magazines, for example, usually have a small map to help you find the company. If you are going to visit someone's house, it's a good idea to ask the person to draw, or fax you, a map of the local area. If you get lost, the best idea is to go to a police station. In Japan, each neighborhood has a small police station, and the police officers there have a map of all the buildings in the area. Giving directions is an important part of their job. Tokyo is a confusing city mainly because ______.