select ar_id,ar_title,ar_mtitle,ar_summary,ar_timestamp,ar_keyword,ar_source FROM uv_article WHERE ar_status=3 AND ar_trend=0 AND ar_del=0 AND ar_source IN ( 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18 ) ORDER BY ar_timestamp DESC limit -20 , 20

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