短語詞組短語class difference definition 類差界說class s definition 類定義class template definition 類模板定義CLASS class DEFINITION 類的定義關(guān)鍵字event class definition file 事件類別定義檔partial class definition 部分類定義Policy Class Definition 策略類定義Material class definition 主材類解說class definition statement 類別定義敘述 返回 class definition