这些帐号都是在一视同仁的基础上给出的，并根据自动使用电子邮件发送的质询来返回一个证明已经收到随机密钥的消息。
These accounts are given out on a non-discriminatory basis, based on an automatic e-mailed challenge to send back a message to prove you received a random key.
米尔格拉姆向随机选中的美国城市居民发送信件，告诉他们如果他们知道住在波士顿的某个股票经理人的话，就把信发给他。
Milgram sent letters to a random selection of people in American cities, telling them that they were to pass the note to a certain stockbroker living in Boston if they knew him by name.
如果对于一个或者多个Thread Group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.
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