在它最繁华的时候是东西方贸易的中心。这座城市有中国最大的明代钟楼，收藏碑石最多的碑林，2000年前的秦始皇兵马俑在这里屹立。 It used to be a ____ connecting the west and the Orient during its prosperous period. Xi'an has the largest ____, which was built in the Ming ___. The largest collection of ancient _____ and the with a ____history of 2,000 years.