The earthquake input energy spectrum of elastic single degree of freedom(SDOF) system under a world-wide ensemble of 40 earthquake records of different site types are studied.是什么意思_The earthquake input energy spectrum of elastic single degree of freedom(SDOF) system under a world-wide ensemble of 40 earthquake records of different site types are studied.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句