You use seriously to indicate that you are not joking and that you really mean what you say. 说真的
adverb [程度副词] 严重地，恶劣地；严肃地，认真地；说正经的，说实在的；<非正式>真的，当真；<非正式>非常，极其
Smoking seriously damages your health. 吸烟严重损害健康。
- seriously 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 1 A puma at large
- Lesson 21 Daniel Mendoza
- Lesson 40 Who's who
- Lesson 6 The sporting spirit
- Lesson 22 Knowledge and progress
- Lesson 44 Patterns of culture
