"once and 全句是：In most sound designs,air showers over the critical area once and then is systematically exhausted from the enclosure.最好把全句都翻译一遍!

once in the Athens Olympics and again once and 全句是：In most sound designs,air showers over the critical area once and then is systematically exhausted from the enclosure.最好把全句都翻译一遍! Once in I smoked only once in a while and for run. I was once fooling,I was once in love and I was happy with you! what occurs once in a minute,twice in a moment,and not once in a hundred years? what's happening once in a minute twice in a week and once in a year?what's well,i usually brush my teeth twice a day,once in the morning and once in the evening. what happens twice in every moment,once in every minute,and never in a thousand years? What comes twice in a moment,once in a minute and never in a hundred years? What happens twice in every moment,once in every minute and never in a thousand years? What comes once in a year,twice in a week and never in a day? 4.What comes once in a year,twice in a week and never in a day? in the crowd once and agai,I look for you in vain, once and for all confirm once and for The once and forever once in lifetime是什么意思,