Symptoms lasting up to 90 days are usually classified as acute bronchitis; symptoms lasting longer, sometimes for months or years, are usually classified as chronic bronchitis.
症状持续90天，往往列为急性支气管炎，症状持续更长几个月或几年，列为慢性支气管炎。
Therefore, the climatic mean computed with long-lasting data is able to represent longer-lasting mean state.
从而使有限年代的资料计算出的气候平均值可以代表更长年代的平均情况。
Therefore, the climatic mean computed with long-lasting data is able to represent longer-lasting mean state.
从而使有限年代的资料计算出的气候平均值可以代表更长年代的平均情况。
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