Cases mentioned by Hughes where there are differences include booting the JVM, creating NIO byte buffers, and dealing with threads and thread groups.
Hughes提到了下面一些区别：JVM启动、NIO字节缓冲区的创建、线程和线程组的处理等。
The thread groups form a tree in which every thread group except the initial thread group has a parent.
树形结构中的线程组除了最顶层的都有自己的父线程组。
For example, to emulate 5 concurrent users, 5 Thread Groups were specified.
例如，模拟5个并发用户，需要指定5个Thread Group。
If multiple threads were specified for one or more thread Groups, then the same message set would have been sent multiple times, defeating the purpose of the random selection criterion.
如果对于一个或者多个ThreadGroup指定多个线程，那么相同的消息集合将会被发送多次，这将违背随机选取准则的目标。
If multiple threads were specified for one or more thread Groups, then the same message set would have been sent multiple times, defeating the purpose of the random selection criterion.
如果对于一个或者多个ThreadGroup指定多个线程，那么相同的消息集合将会被发送多次，这将违背随机选取准则的目标。
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