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。
（三）采取预售方式销售房地产项目；
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Layoffs have remained limited, apart from some high-profile cuts at firms such as Amazon and UPS and the unemployment rate has held steady at around 4.3%. Meanwhile, the wider economy continues to grow, expanding at a robust annual pace of 4.4% in the most recent figures.
Цены на нефть взлетели до максимума за полгода17:55