Mothers' attention and companionship to their children are ever-present. A mother's heart is like my shadow, which is a figurative statement. It emphasizes that a mother's attention and companionship to her children are all the time, just like a shadow, following every movement of her children. Shadow refers to the dark area formed when the object blocks the light, which is closely related to the position and movement of the object. Therefore, the mother's heart is compared to the child's shadow, that is to say, the mother's attention and companionship are like shadows, always accompanying the child, and the mother's heart follows wherever the child goes.