在准备阶段中，协调程序将消息发送到事务中的每个流程，并请求每个流程准备提交。

In the prepare phase, the coordinator sends a message to each process in the transaction, asking each process to prepare to commit.

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目标端使用这些版本准备源需要发送的项目列表。

The destination USES the versions to prepare a list of items that the source needs to send.

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为您想提取的客户数据准备IDocs，并发送该IDocs。

Prepare IDocs for the customer data you want to extract, and send the IDocs.

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