The old town Dunhuang was also named Yang Pass.

敦煌故地﹐亦曰阳关。

youdao

Gas pass gas, the balance of Yin and Yang, is healthy, disease resistance.

气通者，气阴阳平衡者，则健康无病、抗病。

youdao

Gas pass gas, the balance of Yin and Yang, is healthy, disease resistance.

气通者，气阴阳平衡者，则健康无病、抗病。

youdao