Vigorous physical activities involve using a lot of energy, usually to do short and repeated actions. 用力的
adjective [原级] 精力充沛的，充满活力的；强壮的，强健的
Very vigorous exercise can increase the risk of heart attacks. 耗费大量体力的运动会增加心脏病发作的风险。
- vigorous 出现在下面的课文中（提供视频、音频及笔记等可系统性学习）
- Lesson 37 The process of ageing
