A regular round trip remote method call is modeled as two messages, one for the request and one for the response.
一个规则的有往返的远程方法调用有两条消息，一条负责请求，一条负责响应。
The Boolean parameter feelingUnlucky controls whether the method pays the cost of a two round-trip update sequence or gambles on the one-or-three round-trip update sequence.
布尔参数 feelingUnlucky 控制该方法是否需要两次循环才能更新，或者在一次或三次循环间进行博弈。
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