其次，由于搜索是以异步方式进行的，所以我们必须提交一个搜索、等待结果回调、检查中止条件、然后提交另一个搜索。

Next, since the searches take place in an asynchronous fashion, we must submit a search, wait for the result callback, check for the terminating condition, and then submit another search.

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双方共同的异步和同步通信方案要求制定协议(开始和中止)的信息。

Both the common asynchronous and synchronous communication schemes require protocols that provide framing (start and stop) information.

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避免需要使用异步线程中止的代码设计。

Avoid code design that requires the use of asynchronous thread aborts.

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