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。
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。
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