在这个范例中，宣告式呼叫被直接放入类别定义之前，表示这个使用权限将被套用至该类别等级。
In this example, the declarative call is placed directly before the class definition, specifying that this permission be applied to the class level.
然而，如果您将一个宣告式安全性检查置于成员等级上，它只会套用至该成员，并覆写在类别等级上所指定的使用权限(如存在时)。
However, if you place a declarative security check at the member level, it applies to only that member and overrides the permission specified at the class level, if one exists.
材料说明包括材料规格、型号/等级/类别、标称尺寸和适用的材料识别号。
Description of material including material specification, type/grade/class, normal size and material identification applicable.
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