self.conn = sqlite3.connect(db_path)
一个 2.7 亿的模型可能会产生虚假的参数值。如果没有约束，请求“把它变成红色”可能会生成 {“color”: “crimson”} 或 {“color”: “rouge”}。枚举类型强制模型仅从有效值中选择，从而确保函数调用的可靠性。
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New Moon - The Moon is between Earth and the sun, so the side we see is dark (in other words, it's invisible to the eye).
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