这是会话和应用对象提供的，虽然在不同的层次。
This is what the Session and Application objects provide, albeit at different levels.
二者虽然在其形成的历史背景、视角层次、表现形态和表达方式上不同，但它们在实质内容上又是统一的、一脉相承的。
Thongh it is difference of them in background, Angle of view, expression, etc., they are unified and coming down in one continuous line on essential contents.
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