The Bell Tower is the geographical center of Xi 'an and the four main streets are respectively Dong Dajie, Xi Dajie, Nan Dajie and Bei Dajie which are also the main commercial streets.

钟楼是西安市的地理中心，也是四条主要商业大街——东大街、西大街、南大街、北大街——的中心。

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Comparison between histological structures of Dong Bei Improved Sheep skin and the Native Sheep skin as well as the skins of sheep improving at different generations was made in this paper.

本文对东北细毛羊、东北土种绵羊及其不同代数的改良羊的皮肤组织构造进行了对比研究。

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The Bell Tower is the geographical center of Xian and the four main streets are respectively Dong Dajie, Xi Dajie, Nan Dajie and Bei Dajie which are also the main commercial streets.

中国是西安地理位置的中心，紧邻这四条主要的商业街道，东大街、西大街、南大街和北大街。

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