Intangible cultural heritage inheritors Song Tao(L) and Shan Lina show visitors how to creat traditional knotted buttons (or Pankou in Chinese) at the experience area of the third China International Import Expo (CIIE) in Shanghai, November 5, 2020. (Photo: China News Service/Zhang Hengwei)

Intangible cultural heritage inheritors Song Tao and Shan Lina show visitors how to creat traditional knotted buttons (or Pankou in Chinese) at the experience area of the third China International Import Expo (CIIE) in Shanghai, November 5, 2020. (Photo: China News Service/Zhang Hengwei)

Intangible cultural heritage inheritor Shan Lina shows how to creat traditional knotted buttons (or Pankou in Chinese) at the experience area of the third China International Import Expo (CIIE) in Shanghai, November 5, 2020. (Photo: China News Service/Zhang Hengwei)

Intangible cultural heritage inheritors Song Tao and Shan Lina show visitors how to creat traditional knotted buttons (or Pankou in Chinese) at the experience area of the third China International Import Expo (CIIE) in Shanghai, November 5, 2020. (Photo: China News Service/Zhang Hengwei)