不期而遇的期字是什么意思

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select * from tbl_Articles WHERE ArticleID=121031 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=121031 LIMIT 0,1
select * from tbl_Articles_sphinx where id=121031 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1056152,1068532,1634544,1089662,1283770,1095508,1049344,1068874,1052311,988905,1500069,1465483,1096120,1090196,1335129,2620183,1057696,1105261,1075859,1071077,2174684,1068973,1103851,1073407,1880459,1664174,1072093,2538608,1766372,1084303) ORDER BY field (ArticleID,1056152,1068532,1634544,1089662,1283770,1095508,1049344,1068874,1052311,988905,1500069,1465483,1096120,1090196,1335129,2620183,1057696,1105261,1075859,1071077,2174684,1068973,1103851,1073407,1880459,1664174,1072093,2538608,1766372,1084303)