该查询首先经过编译，然后在那个数据源上开始执行。
The query is compiled and execution of the query at the data source starts.
你的产假审请应当首先经过你的主管人批准，才能办手续。
You are supposed to have your request for maternity leave approved by your supervisor before it can be processed.
ItemManagement应用提供的数据必须首先经过转换。
Data provided by the ItemManagement application needs to be first transformed.
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