Install boto and set up your environment.
安装boto并设置环境。
The default option in boto is to return one message.
boto中的默认设置是返回一个消息。
Create a new message by using the boto message class, as shown in Listing 8.
使用botomessage类创建新消息，见清单8。
The boto library always checks the environment first to see if these variables are set.
boto库总是先检查是否设置了这些环境变量。
The boto library always checks the environment first to see if these variables are set.
boto库总是先检查是否设置了这些环境变量。
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