blocking g UI 模块化用户界面
The WorkerPool module runs operations in the background, without blocking the UI.
工作者池模块在后台运行操作，因此不会阻塞用户界面。
This step is done to avoid blocking the main UI thread.
这一步是为了避免阻塞主ui线程。
Often the user interface does not seem to support making calls asynchronously, since the UI is blocking on a call that may take a while.
通常用户接口不能支持异步调用，因为UI阻碍了调用，可能需等候一段时间。
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