Error, notification (alert), and confirmation messages are blocking bulletin dialogs. As we shall see, even these can and should be avoided in most circumstances.

错误、通知(警告)和确认消息都是阻塞型公告对话框，我们将看到在大多数情况下就算是这些也都能够避免，并且应该避免。

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An alert notifies a user of the program's action, whereas a confirmation also gives a user the authority to override that action.

警告通知用户程序的行为，而确认给用户赋予一种忽略该行为的权力。

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Participants will assess the feasibility of exchanging sea-level data which can confirm the tsunami and provide information on its amplitude although, in the Mediterranean, due to short tsunami waves travel time, it is not always possible to wait for such confirmation before issuing the alert.

UNESCO: Communication and Information