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。
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