The meaning of watering a tree and watering its roots: To water a tree, you must water its roots. The tree roots are rooted in the soil and absorb water and nutrients in the soil, just like the blood vessels of the human body, absorbing them from the roots. , and then flows into the whole body of the tree, and the roots absorb water strongly, so the roots should be watered when watering. When planting flowers and plants, you need to water and fertilize their roots to grow well. This metaphor is to grasp the root of doing things.

The previous sentence is "Make friends with your heart." When making friends, you should make close friends, not fair-weather friends. When interacting with people, you should be sincere and treat your friends with your heart.