Run rake db: migrate to drop the existing DOCUMENTS table, create the new XML-data-only table called XML_CONTENTS, and the new DOCUMENTS table (without the XML column).
运行rakedb：migrate以删除现有的documents表、创建只存储XML数据的新表xml_contents和新的documents表(不包含xml列)。
Mechanical table table is marked by a lot of lines, you can drop one or two drops of water on the table, and then squeeze a little toothpaste rub, you can remove the lines and make the table a new.
伯爵机械表表蒙被划出很多道纹以后，可以在表蒙上先滴一二滴清水，再挤一点牙膏擦涂，就可以把划纹去掉而使表蒙如新了。
Quartz table is marked with a lot of lines, you can drop one or two drops of water on the table, and then squeeze a little toothpaste rub, you can remove the lines and make the table a new.
石英表蒙被划出很多道纹以后，可以在表蒙上先滴一二滴清水，再挤一点牙膏擦涂，就可以把划纹去掉而使表蒙如新了。
Watch has been marked out a lot of stripes, you can drop one or two drops of water on the table, and then squeeze a little toothpaste rub, you can remove the lines and make the table a new.
手表蒙被划出很多道纹以后，可以在表蒙上先滴一二滴清水，再挤一点牙膏擦涂，就可以把划纹去掉而使表蒙如新了。
Watch has been marked out a lot of stripes, you can drop one or two drops of water on the table, and then squeeze a little toothpaste rub, you can remove the lines and make the table a new.
手表蒙被划出很多道纹以后，可以在表蒙上先滴一二滴清水，再挤一点牙膏擦涂，就可以把划纹去掉而使表蒙如新了。
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