To get a cardio workout and tone your muscles... you will want to take it slow for a long duration.
为了磨练自己和锻炼肌肉，应该缓慢的进行维持一段时间。
Chronic diseases are diseases of long duration and generally slow progression, such as heart disease, stroke, cancer, chronic respiratory diseases.
慢性病是一种长期的疗效缓慢的疾病，例如心脏病、中风、癌症、慢性呼吸道疾病等。
Chronic diseases are diseases of long duration and generally slow progression, such as heart disease, stroke, cancer, chronic respiratory diseases.
慢性病是一种长期的疗效缓慢的疾病，例如心脏病、中风、癌症、慢性呼吸道疾病等。
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