"This way" means that once something is lost, people will miss it, and people will only think of health and happiness when they are sick.

2. Not so good. "Only deaf people cherish the light more" means that deaf people are more afraid of losing the light because of deafness, know the pain of disability and cherish it after losing it, and are afraid of blindness on the basis of deafness. Changing it to "blind" or "blind" will not have this effect.

The colorful and ever-changing colors that adorn the world are so mediocre to the discerning eye. Do not know how to cherish what you have, but blindly pursue what you don't have. People with discerning eyes often see these things, and they don't feel special or cherish them.

4. Normal function cherishes life

People in modern society are more immersed in material abundance, but they are lost in their hearts, do not know how to cherish life and do not understand the meaning of life. The author wants more people to know how to cherish life.

The answer is not very good, please forgive me.