Workers pick silkworm cocoons at a silkworm breeding base in Hai'an, east China's Jiangsu Province, June 3, 2019. Farmers in Hai'an are busy harvesting spring cocoons recently, which serve as the raw material for many silk products including silk textiles, cosmetics, and artworks. (Photo: Xinhua)

Staff members weigh silkworm cocoons at a collecting spot in Hai'an, east China's Jiangsu Province, June 3, 2019. Farmers in Hai'an are busy harvesting spring cocoons recently, which serve as the raw material for many silk products including silk textiles, cosmetics, and artworks. (Photo: Xinhua)

Staff members pile up silkworm cocoons at a collecting spot in Hai'an City, east China's Jiangsu Province, June 3, 2019. Farmers in Hai'an are busy harvesting spring cocoons recently, which serve as the raw material for many silk products including silk textiles, cosmetics, and artworks. (Photo: Xinhua)

A farmer shows silkworm cocoons at a collecting spot in Hai'an, east China's Jiangsu Province, June 3, 2019. Farmers in Hai'an are busy harvesting spring cocoons recently, which serve as the raw material for many silk products including silk textiles, cosmetics, and artworks. (Photo: Xinhua)

Staff members work at a collecting spot of silkworm cocoons in Hai'an City, east China's Jiangsu Province, June 3, 2019. Farmers in Hai'an are busy harvesting spring cocoons recently, which serve as the raw material for many silk products including silk textiles, cosmetics, and artworks. (Photo: Xinhua)