The English version of "彩虹的微笑" is called "Rainbow Smile".
"Rainbow" represents the beautiful multi-colored natural phenomenon that occurs after rain, symbolizing hope, positivity, and joy. "Smile" refers to the expression of happiness and pleasure on one's face, representing a feeling of contentment and well-being.
Combining these two words, "Rainbow Smile" portrays a euphoric and cheerful state of mind, emphasizing the ability to find happiness and positivity even in difficult times. It suggests that by embracing the diverse colors and elements of life, we can achieve a radiant and joyful outlook.