求翻译：西藏地处中国西南部。13世纪中叶，正式纳入中国元代版图。尽管中国经历多次改朝换代、政权更迭，但是，西藏始终在中央政府控制之下，是中国的一个不可分割的部分是什么意思？

Tibet is located in southwestern China. Mid-13th century, the territory formally part of China's Yuan Dynasty. Although China has experienced several regime change, regime change, however, Tibet has always been under the control of the central government, is an integral part of China

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Tibet is situated at the Chinese north west.13 century middles, integrate the Chinese Yuan Dynasty domain officially.Although China experiences changes from one dynasty to another many times, the political power alternates under, but, Tibet controls throughout in the central authorities, is a China'

Tibet is located in Southwest China. By the middle of 13th century, and officially included in the Yuan Dynasty landscape. While the country experienced numerous changes, regime change, however, always under the control of the Central Government in Tibet, is an integral part of China

Tibet is located in southwestern China. Mid-13th century, the territory formally part of China's Yuan Dynasty. Although China has experienced several regime change, regime change, however, Tibet has always been under the control of the central government, is an integral part of China