Undated file photo shows a salt-fetching team marches on their way in southwest China's Tibet Autonomous Region. The salt-fetch teams, consisting of twenty to thirty people and some five hundred yaks, started its long journey at the end of winter every year. (Xinhua Photo)

Undated file photo shows a tea-carrying team marches on their way in southwest China's Tibet Autonomous Region. As Tibetan people keep the traditional habit of drinking tea, tea had been carried into Tibet with mules for many years. (Xinhua Photo)

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