第一条 为了高质量推进自然保护区建设，加强对自然保护区的保护和管理，全面推进生态文明和美丽中国建设，加快推进人与自然和谐共生的现代化，制定本条例。
The spec does not mandate buffer limits for tee(). And to be fair, the spec allows implementations to implement the actual internal mechanisms for tee()and other APIs in any way they see fit so long as the observable normative requirements of the specification are met. But if an implementation chooses to implement tee() in the specific way described by the streams specification, then tee() will come with a built-in memory management issue that is difficult to work around.，更多细节参见体育直播
。体育直播对此有专业解读
So that's the baseline of where the cursor already goes. What can we do with this?
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This is of course a logical illusion; under the hood, no matter the database, no matter the update scope, the whole document/row is physically rewritten on the disk.