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They must be private, cannot return a value, and cannot have out parameters.
它们必须是私有的，不能返回值，不能有输出参数。
youdao
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The error code and message are returned to the caller as OUT parameters.
错误代码和消息被作为OUT参数返回给调用者。
youdao
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The error code and message are returned to the caller as OUT parameters.
错误代码和消息被作为OUT参数返回给调用者。
youdao