类型构造函数也称为类型初始值设定项。

Type constructors are also known as type initializers.

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类型在两种情况下会获取类型初始值设定项。

A type will gain a type initializer in two scenarios.

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第二种情况是，类型具有一个用于静态字段的初始值设定项，在这种情况下，编译器会在后台添加类型构造函数。

The second scenario is when a type has a initializer for a static field, in which case the compiler adds a type constructor behind the scenes.

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