Ragweed pollen, the allergenic one, reached its maximum in the atmosphere in August and showed a peak of diurnal periodicity at 7:00-9:00 am.是什么意思_Ragweed pollen, the allergenic one, reached its maximum in the atmosphere in August and showed a peak of diurnal periodicity at 7:00-9:00 am.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句