东道主中的东道指的是什么

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select * from tbl_Articles WHERE ArticleID=907447 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=907447 LIMIT 0,1
select * from tbl_Articles_sphinx where id=907447 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1091631,1107621,1737308,1098377,1106623,631267,1116553,1595742,1303802,3463860,563128,1102516,1106922,2135405,1116031,1117241,1119542,1305368,3133538,1085268,1115751,1105207,3161197,931440,864605,1104430,3100105,3120012,1275211,1106416) ORDER BY field (ArticleID,1091631,1107621,1737308,1098377,1106623,631267,1116553,1595742,1303802,3463860,563128,1102516,1106922,2135405,1116031,1117241,1119542,1305368,3133538,1085268,1115751,1105207,3161197,931440,864605,1104430,3100105,3120012,1275211,1106416)