元鼎
元鼎-
元鼎五年，汉武帝西行巡游到达祖厉县，临黄河而返。
Yuan Ding five years , Emperor Li westbound parade to the Dazu County , and the temporary return of the Yellow River .
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汉武帝元鼎六年（前121年）置张掖郡，取“张国臂掖，以通西域”之意。
Emperoryuan ding six years ( 121 years ago ) Zhangye County home , check " Zhang Yedan arm to pass in the Western Regions " means .