建立一个工程，主线程负责用户交互，界面上提供一个按钮，通过它用户建立一个新的线程处理复杂的计算。多个线程可以共享内存中的某些变量。线程可以中止，挂起。线程间需要同步。-The establishment of a project, provide a button in the main thread is responsible for user interaction, interface, through which users establish a new thread to handle complex calculations. Multiple threads can share some of the variables in the memory. Thread can suspend, hang. Inter-thread synchronization.