Photo taken on April 2, 2019 shows materials and seasoners for making Lanzhou beef noodles at a noodle restaurant in Lanzhou, capital of northwest China's Gansu Province. Lanzhou beef noodles, a Chinese hand-pulled noodle originated in Lanzhou, has a history of about 100 years. There are about ten types of noodles of different width and shapes, depending on noodle chefs' pulling skills. It has won fame both at home and abroad with its speciality of noodles and soup recipe. (Xinhua/Ma Ping)

Staff workers prepare beef noodles at a beef noodle restaurant in Lanzhou, capital of northwest China's Gansu Province, April 2, 2019. (Xinhua/Ma Ning)

Ma Wenbin, an inheritor of Lanzhou beef noodle, pulls noodles at a beef noodle restaurant in Lanzhou, capital of northwest China's Gansu Province, April 2, 2019.  (Xinhua/Liu Jie)

Photo taken on April 2, 2019 shows cold dishes at a beef noodle restaurant in Lanzhou, capital of northwest China's Gansu Province. (Xinhua/Ma Ning)

A noodle chef adds chili oil to noodles at a beef noodle restaurant in Lanzhou, capital of northwest China's Gansu Province, April 2, 2019. (Xinhua/Li Xiao)

Photo taken on April 2, 2019 shows cold dishes at a beef noodle restaurant in Lanzhou, capital of northwest China's Gansu Province. (Xinhua/Ma Ning)

Ma Wenbin, an inheritor of Lanzhou beef noodle, makes noodles at a beef noodle restaurant in Lanzhou, capital of northwest China's Gansu Province, April 2, 2019. (Xinhua/Liu Jie)

A waitress serves beef noodles at a beef noodle restaurant in Lanzhou, capital of northwest China's Gansu Province, April 2, 2019. (Xinhua/Ma Ning)

Customers eat beef noodles at a beef noodle restaurant in Lanzhou, capital of northwest China's Gansu Province, April 2, 2019. (Xinhua/Li Xiao)

A staff worker prepares cold dishes at a beef noodle restaurant in Lanzhou, capital of northwest China's Gansu Province, April 2, 2019.(Xinhua/Ma Ning)