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According to at least two observational studies, you have to drink at least nine cups of coffee a day to put yourself at risk of arrhythmia.
Original Video：
What Happens To Your Body When You Drink Too Much Coffee
Key Vocabulary
1. observational
observational
[ˌɑːb.zɚˈveɪ.ʃən.əl] (adj.)
2. study
study
[ˈstʌd.i] (n.)
3. risk
risk
[rɪsk] (n.)
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