Children learn to wash hands at a kindergarten on the occasion of World Health Day in Taizhou City, east China's Zhejiang Province, April 7, 2021. [Photo/Xinhua]

Teachers learn emergency rescue techniques from a medical worker at a kindergarten on the occasion of World Health Day in Xingtai City, north China's Hebei Province, April 7, 2021. [Photo/Xinhua]

Children learn to wash hands at a kindergarten on the occasion of World Health Day in Xingtai City, north China's Hebei Province, April 7, 2021. [Photo/Xinhua]

Children wash toys at a kindergarten on the occasion of World Health Day in Xingtai City, north China's Hebei Province, April 7, 2021. [Photo/Xinhua]

Children learn to wash hands at a kindergarten on the occasion of World Health Day in Xingtai City, north China's Hebei Province, April 7, 2021. [Photo/Xinhua]

Children learn how to wear a mask correctly at a kindergarten on the occasion of World Health Day in Xingtai City, north China's Hebei Province, April 7, 2021. [Photo/Xinhua]