纵观海啸预警系统的历史，其警报纯粹是建立在地震信息的基础之上，譬如对震级、位置和深度的估计。
Throughout most of the history of the tsunami warning system, the warnings were based purely on the earthquake information-our best guess for the magnitude, location and depth.
纵观海啸预警系统的历史，其警报纯粹是建立在地震信息的基础之上，譬如对震级、位置和深度的估计。
Throughout most of the history of the tsunami warning system, the warnings were based purely on the earthquake information-our best guess for the magnitude, location and depth.
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