学生中午下课后刚进入食堂时能够闻到饭菜的香味，过一会这种香味的感觉没有了，这是下列哪种现象

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24410' and id < 2102002 and id<>'2102002' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24410' and id > 2102002 and id<>'2102002' order by id asc limit 5