Both have the same pitch diameter at the top of the hole of internal threads or end of the pipe on external threads, and both have the same thread lengths or depths.

在内螺纹的孔的顶端或者外螺纹的管的端部拥有相同的中径，而且拥有相同的螺纹长度和深度。

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Many times, however, processes contain multiple threads, where a few threads perform the core application logic while the rest service the external requests.

不过很多时候，进程包含多个线程，其中少数线程执行核心应用程序逻辑，同时，其余线程为外部请求提供服务。

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In a synchronous scenario, a slowly responding external resource or fully utilized connection pool will tie up the upstream processing threads until the bottleneck is alleviated.

在一个同步场景中，一个缓慢响应的外部资源或完全利用的连接池将捆绑上游线程，直到该瓶颈得到缓解。

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