这个类型规范会保留所储存物件的资料型别。
The type specifier holds the data type of the object being saved.
主要目的是要储存物件的状态，以便能在需要时重新建立该物件。
Its main purpose is to save the state of an object in order to be able to recreate it when needed.
一旦没有其他程序会储存物件的参考，也没有程序码在执行时，应用程序就会立即关闭。
The application closes as soon as there are no other programs holding references to its objects and none of its code is running.
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