There is no need to explain it to children in a profound way. Just make it clear that only a little of the sunlight shining on the surface of the moon is reflected by the moon, but these reflected lights are enough to make the moon bright and clear in the night sky. Here you can demonstrate with a flashlight and a mirror.

Kindergarten is a pre-school education institution focusing on the care and education of young children, and usually accepts children aged three to six. Kindergartens can lift the restrictions of family time, space and environment when cultivating children, so that children can develop physically and mentally healthily. Kindergarten education is the preparatory education for children and the foundation of the whole education system. It consists of basic education courses (language, science, art, health and society) and various activities.