并列题名：Medial axis of Beijing 并列题名：Central axis of Beijing Medial axis of Beijing 并列题名：Media axia of Beijing city 并列题名：Old Trades of Beijing 并列题名：Old walls of Beijing 并列题名：Sextants of Beijing 并列题名：Memorial spaces in Beijing 并列题名：Birds of Beijing 并列题名：Gates of Beijing