什么是伸缩缝

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select * from tbl_Articles WHERE ArticleID=3543616 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3543616 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3543616 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3541028,3530712,3542279,3541043,3542664,3543821,3541512,3540561,3544567,3543273,3543345,3540781,3542779,3529347,3543674,3529021,3527714,3542321,3542036,3541437,3542473,3540890,3541880,3541783,3542129,3540827,1066342,3527795,3540700,3541571) ORDER BY field (ArticleID,3541028,3530712,3542279,3541043,3542664,3543821,3541512,3540561,3544567,3543273,3543345,3540781,3542779,3529347,3543674,3529021,3527714,3542321,3542036,3541437,3542473,3540890,3541880,3541783,3542129,3540827,1066342,3527795,3540700,3541571)