Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
The book raised an important topic in the study of history without providing any clear answers or real attempts to address the question of how the nation should respond to the crisis or challenges. This Chinese version hasn’t done the good job to express the author’s thoughts.
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