ObjectiveDuring the spreading of respiratory epidemic,to change all-air central air conditioning system in order to clean dust and steri lize air,and to reduce the second pollution and cut off the way of spreading vir us.是什么意思_ObjectiveDuring the spreading of respiratory epidemic,to change all-air central air conditioning system in order to clean dust and steri lize air,and to reduce the second pollution and cut off the way of spreading vir us.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句