Aerial photo taken on March 11, 2019 shows a train running on the Chengdu-Ya'an railway in Ya'an City, southwest China's Sichuan Province. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages. (Photos: Xinhua/Xue Yubin)

Aerial photo taken on March 11, 2019 shows a train running on the Chengdu-Ya'an railway in Chongzhou City, southwest China's Sichuan Province. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages.

A worker checks Tibetan tea at a tea company in Ya'an, southwest China's Sichuan Province, June 15, 2019. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages.

Workers make Tibetan tea at a tea company in Ya'an, southwest China's Sichuan Province, June 15, 2019. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages.

Bricks of Tibetan tea are displayed at a tea company in Ya'an, southwest China's Sichuan Province, June 15, 2019. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages.

A worker makes Tibetan tea at a tea company in Ya'an, southwest China's Sichuan Province, June 15, 2019. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages.

Aerial photo taken on March 11, 2019 shows a train running on the Chengdu-Ya'an railway in Chongzhou City, southwest China's Sichuan Province. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages.

A worker checks Tibetan tea at a tea company in Ya'an, southwest China's Sichuan Province, June 15, 2019. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages.

Aerial photo taken on March 11, 2019 shows a train running on the Chengdu-Ya'an railway in Chongzhou City, southwest China's Sichuan Province. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages.

Aerial photo taken on March 11, 2019 shows a train running on the Chengdu-Ya'an railway in Ya'an City, southwest China's Sichuan Province. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages.

A worker checks Tibetan tea at a tea company in Ya'an, southwest China's Sichuan Province, June 15, 2019. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages.

Aerial photo taken on March 11, 2019 shows a train running on the Chengdu-Ya'an railway in Ya'an City, southwest China's Sichuan Province. The Chengdu-Ya'an railway, an important part of the Sichuan-Tibet railway, has a length of 140 kilometers and was put into operation on Dec. 28, 2018. Ya'an, a region connecting the Sichuan basin and the Qinghai-Tibet plateau, played a vital role during the ancient times for the Tea Horse Road between Sichuan and Tibet. As a result, the making of Tibetan tea has been passed down through generations and listed as one of the national intangible cultural heritages.