When the behavior of an event-driven application depends upon the order in which events occur, its programming can become very tangled, and consequently difficult to debug and modify.
当事件驱动的应用程序的行为取决于事件发生的顺序时，其编程就会变得非常复杂，也十分难以调试和修改。
The method is very efficient for solving a difficult problem in gear design programming.
此法有效的解决了齿轮设计编程中的一个难题。
He also said that with the passage of time, the operating system can support multi-processing chip, but programming it is very difficult obstacle to overcome.
他还说，随着时间的推移，操作系统能支持多处理芯片，但编程的障碍很难克服。
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