The data transfer thread will be blocked until the transfer is complete, so it will not be able to process the window messages as soon as they arrive.
数据传输线程在完成传输前将被阻塞，因此在窗口消息到达时它将不能及时处理这些消息。
Since countries have different levels of information technologies, data transfer standard in single window systems is not uniform.
由于各国信息技术水平不同，单一窗口系统中的数据转移标准并不统一。
Therefore, to unify global data transfer standard and establish a global single window system has a long way to go.
因此，统一全球数据转移标准并建立全球性的单一窗口系统任重而道远。
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