哮喘是一种慢性呼吸道疾病，以呼吸急促和喘息反复发作为特征。
Asthma is a chronic disease of the airways characterized by recurrent attacks of breathlessness and wheezing.
答：哮喘是一种慢性呼吸疾病，特征是呼吸急促和喘息反复发作。
A: Asthma is a chronic breathing disorder characterized by recurrent attacks of breathlessness and wheezing.
专家说，重要的就是患者应该有多种策略，以防止肾结石反复发作。
What's important, say experts, is that patients have multiple strategies to help prevent recurrent attacks.
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