Providing feedback to user for a long running operation (such as a wait cursor)
提供运行时间长的操作的反馈（如等待游标）。
Any long running operation that operates on the main thread will cause an application to freeze up.
任何在主线程上运行的这类操作都会导致应用程序冻结。
If your application has a button to cancel a long-running operation but you're doing work in the UI thread, the cancellation event won't be delivered until after the operation has finished!
如果应用程序有一个按钮用于取消某个长时间运行的操作，而您正在使用UI线程执行操作，那么这个取消事件只有到UI线程所做的操作完成后才会被处理！
This paper analyzes the factors which affect the quality of casing running during casing running operation.
分析在下套管作业中，影响其作业质量的因素。
This paper analyzes the factors which affect the quality of casing running during casing running operation.
分析在下套管作业中，影响其作业质量的因素。
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