Peak ages from 15-18 to 25years: age distribution is bimodal, with second peak in the elderly (ages 65-75); this group has a higher mortality rate.是什么意思_Peak ages from 15-18 to 25years: age distribution is bimodal, with second peak in the elderly (ages 65-75); this group has a higher mortality rate.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句