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世界地震工学会議
World Conference on Earthquake Engineeringnoun
は
topic markergrammar
4年
four years-> 四年noun
に
direction, time, indirect object, or target markergrammar
一度
once; one time; on one occasion; temporarily; for a time; for a moment; one degree; one tone; one musical intervalnoun, adverb
開催
hold (an event); host; opennoun, suru verb
される。
passive, potential, or respect auxiliarygrammar