It is generally understood that a ballad is a song that tells a story, but a folk song is not so easily defined. A ballad is a folk song, but a folk song is not a ballad unless it tells a story.
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机译:Prediction Method Study on the Remaining Useful Life of Plant New Varieties Rights Based on Weibull Survival Function and Gaussian Model——Taking Hybrid Rice Variety for Example基于威布尔生存分布和高斯模型的品种权寿命预测研究——以杂交水稻品种为例