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What is the sentence that points out the main idea of Wisteria Falls? How to understand this sentence

Main sentence: flowers and people will encounter all kinds of misfortunes, but the long river of life is endless.

The long road of life is bound to encounter many setbacks. Flowers will bloom again when they fade, which shows that flowers are open-minded to life. People should also learn to let go when overcoming difficulties. Don't just remember the pain, otherwise it will be difficult to laugh again.