编程模型是优雅的，基于构造函数的风格意味着您无需包括无参构造函数。
The programming model is elegant, and the constructor-based style means you don't have to include a constructor without arguments.
编程模型是优雅的，基于构造函数的风格意味着您无需包括无参构造函数。
The programming model is elegant, and the constructor-based style means you don't have to include a constructor without arguments.
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