Years are ruthless, time flies, flowers bloom and fall, and the song ends. With the passage of youth, things are different and people are also sad and confused. Good times are easy to pass, and things are different. The wind is sad, and people hesitate. Expressed a feeling and helplessness about the passage of time and the change of things. The words "Time is ruthless, time flies, flowers bloom and fall, and the song ends" express a kind of feeling and helplessness for the passage of time. Time is ruthless, and time flies, which means that time is gone forever, and the past time cannot be retrieved. Flowers bloom, flowers fall, and the song ends, expressing that life is constantly experiencing the cycle of birth, death, separation and reunion, and will eventually face the fate of separation and end. The meaning of this sentence just echoes the ruthlessness of time. Time flies, flowers bloom and flowers fall, and the song ends, which can be used as the next sentence.