Because multiple concurrent XML HTTP requests can be scheduled in parallel, our application essentially becomes a concurrent program — and concurrency is hard.
由于可能同时调度多个并发的XMLHTTP请求，应用程序本质上变成了一个并发程序，而并发很难实现。
In a concurrent program, different parts of the program can execute concurrently.
而在并发程序中，程序的不同部分可被同时执行。
Compared with the sequential program, the concurrent program is clearly more prone to error.
与顺序执行的程序相比，并发程序中显然更加容易出现错误。
Writing a correct program is not easy while writing a correct concurrent program is even harder.
编写正确的程序并不容易，而编写正确的并发程序就更难了。
Writing a correct program is not easy while writing a correct concurrent program is even harder.
编写正确的程序并不容易，而编写正确的并发程序就更难了。
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