超车时为什么要减档

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select * from tbl_Articles WHERE ArticleID=707915 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=707915 LIMIT 0,1
select * from tbl_Articles_sphinx where id=707915 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1072673,239819,268770,129251,2358188,1129801,3007570,232715,219925,270664,121326,1093799,269373,1343962,1085172,187065,2516729,256493,236675,1104531,1085154,337760,1112919,156040,1041761,237531,1081991,1075959,230196,229379) ORDER BY field (ArticleID,1072673,239819,268770,129251,2358188,1129801,3007570,232715,219925,270664,121326,1093799,269373,1343962,1085172,187065,2516729,256493,236675,1104531,1085154,337760,1112919,156040,1041761,237531,1081991,1075959,230196,229379)