• 1. Class-reference types: 类引用类型

• 1.Other features include class invariants, non-nullable reference types, and enhanced static analysis capabilities.
  其他的特性还包括类不变量、非空引用类型和加强的静态分析功能。
  dict.yoduao.com
• 2.For reference types, an implicit conversion always exists from a class to any one of its direct or indirect base classes or interfaces.
  对于引用类型，隐式转换始终存在于从一个类转换为该类的任何一个直接或间接的基类或接口的情况。
  dict.yoduao.com
• 3.But classes are reference types, and an object variable can refer to various class instances at different times.
  而类是引用类型，对象变量可在不同的时间引用各种类实例。
  dict.yoduao.com

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