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1.Smiling makes us attractive微笑使我们有吸引力
2.Smiling Changes Our Mood微笑改变我们的心情
3. Smiling is Contagious微笑会传染
4. Smiling Relieves Stress微笑可以减压
5. Smiling Boosts Your Immune System微笑增强免疫力
6. Smiling Helps You Stay Positive微笑让你保持积极
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