- 問題詳情:ApowerfulearthquakestruckthenortheasterncoastofJapanattwoforty-sixp.m.localtimeonMarcheleventh.2011.Japan'sMeteorologicalAgencyreleaseditsfirsttsunami(海嘯)warningsjustthreeminuteslater.Thecountryhasoneofthebestearthquakeearlywarningsystemsint...
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