1. Because they are tired of the rich days and want to experience a new life, such as Party A and Party B;
2. Because they want the next generation to experience the hard times and remember the bitter and sweet, such as Metamorphoses;
3. Literature and art workers need to experience life, such as the Yellow Earth;
Fourth, an accident occurred during travel, and the nanny brought the child home because of an emergency, such as the Tongtian Tower;
Fifth, because of the objective environment such as war, such as the Romance of the Three Kingdoms;
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