楼梯台阶为什么是单数

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select * from tbl_Articles WHERE ArticleID=3544387 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3544387 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3544387 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3529914,1070634,3540843,3541293,3533347,3541581,3531939,3540751,3540755,3527795,3541221,1081131,3542016,3540759,3541706,3527956,3540826,3541335,3530955,3533203,3541856,3542303,3540670,3542159,3541229,3530240,3531797,3542048,3542037,3527527) ORDER BY field (ArticleID,3529914,1070634,3540843,3541293,3533347,3541581,3531939,3540751,3540755,3527795,3541221,1081131,3542016,3540759,3541706,3527956,3540826,3541335,3530955,3533203,3541856,3542303,3540670,3542159,3541229,3530240,3531797,3542048,3542037,3527527)