METHODS After ultrasonic extraction in 50% acetonitrile (v/v) at room temperature, tea samples were analyzed by HPLC-DAD/MS/MS.是什么意思_METHODS After ultrasonic extraction in 50% acetonitrile (v/v) at room temperature, tea samples were analyzed by HPLC-DAD/MS/MS.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句