One hundred and twenty seven school boys, aged 8, 12, or 18 years, were studied to measure blood pressure and 24-hour urinary electrolyte excretion.是什么意思_One hundred and twenty seven school boys, aged 8, 12, or 18 years, were studied to measure blood pressure and 24-hour urinary electrolyte excretion.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句