Asthma is a chronic disease characterized by recurrent attacks of breathlessness and wheezing, which vary in severity and frequency from person to person.
哮喘是一种慢性病，以呼吸困难和喘息反复发作为特征，其严重程度和发作频率因人而异。
The parents' responses had a particularly strong effect on the frequency of symptoms in girls: reinforcing parental responses raised their risk of recurrent headaches by 25%.
父母的反应对女孩们频发的症状有一个特别强的作用：加强父母亲的反应增加25％头痛复发的风险。
A sensitivity predictive controller with memory recurrent network for use in the comprehensive control of the water hammer and the frequency is proposed.
提出一种对水轮发电机组水压频率进行综合调节的记忆递归网络灵敏度预测控制器。
To evaluate the effect of high frequency electrocautery ablation in the treatment of recurrent ingrown toenails.
目的评价高频电刀治疗复发性嵌甲的疗效。
To establish whether grommet insertion reduces the frequency of episodes of recurrent acute otitis media and the proportion of children with symptoms of ear disease.
为了解通气管的置入，能否降低儿童反复发作急性中耳炎的频率，及耳疾症状的比率。
High frequency electrocautery ablation in the treatment of recurrent ingrown toenails is effective and the procedures are simple.
结论高频电刀治疗复发性嵌甲疗效好，操作简单。
The frequency and severity of the recurrent episodes vary greatly.
复发的频率和复发症状的严重程度在不同的人之中差别非常大。
Objective: To study the frequency, risk factors and prognosis of recurrent cerebral hemorrhage(RCH).
目的：探讨复发性脑出血的发生率、危险因素及预后。
Objective: To study the frequency, risk factors and prognosis of recurrent cerebral hemorrhage(RCH).
目的：探讨复发性脑出血的发生率、危险因素及预后。
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