为什么力臂越长越省力

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select * from tbl_Articles WHERE ArticleID=2130028 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2130028 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2130028 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(109630,2989527,634268,1801010,1063097,1111640,1372281,1275900,2847593,376729,582266,1404910,492975,313412,1074434,2808055,1087313,1280255,1098569,1119690,150748,817691,1098483,1103285,398734,3335202,1348211,264882,888504,234664) ORDER BY field (ArticleID,109630,2989527,634268,1801010,1063097,1111640,1372281,1275900,2847593,376729,582266,1404910,492975,313412,1074434,2808055,1087313,1280255,1098569,1119690,150748,817691,1098483,1103285,398734,3335202,1348211,264882,888504,234664)