The thresholds of the low frequencies increased by 1.0 decibel in the folic acid group and by 1.7 decibels in the placebo group, the researchers said.是什么意思_The thresholds of the low frequencies increased by 1.0 decibel in the folic acid group and by 1.7 decibels in the placebo group, the researchers said.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句