Since 1974 there has been a downturn in the coronary death rate in the United States, largely attributable to the growing arsenal of preventive, diagnostic and treatment techniques developed.是什么意思_Since 1974 there has been a downturn in the coronary death rate in the United States, largely attributable to the growing arsenal of preventive, diagnostic and treatment techniques developed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句