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！
Simple operation, adjustment can be fixed after long working hours, equipment failure rate is a low.
操作简单，调整固定后可长时间工作，设备故障率极低。
We spoke with Doctor Sapperstein just after he finished a long, difficult root canal on a patient. If he had to choose between another operation like that or a fight with his wife?
我们在埃文刚做完一个耗时长、难度大的牙根管治疗手术后对其进行了采访，你是选择再做一次这样的手术治疗，还是选择和妻子吵架？
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