为什么要限制齿轮的最小齿数

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select * from tbl_Articles WHERE ArticleID=2439728 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2439728 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2439728 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1103234,1089064,1067265,1066442,1069045,1091637,1097975,1078477,1064061,1094442,1370312,1126072,1104335,1078725,1046512,1057710,1084093,1059016,1063181,1070963,1082469,1096248,1104280,1059338,1071843,1101273,1101847,1091625,1080995,1092642) ORDER BY field (ArticleID,1103234,1089064,1067265,1066442,1069045,1091637,1097975,1078477,1064061,1094442,1370312,1126072,1104335,1078725,1046512,1057710,1084093,1059016,1063181,1070963,1082469,1096248,1104280,1059338,1071843,1101273,1101847,1091625,1080995,1092642)