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• ▶ Electricity Basics Ep.26 – What is an electric field?｜Audio Book ｜ Easy to listen to! 전병칠 · 2025.09.09

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• 교내 휴대전화 사용 반대 (Should school allow students to use their mobile phone in class - Disagree) Second, mobile phones have electric wave and this could be harm to students. In our brain, there are cells that can be affect by the electric wave which could cause a disease. blog.naver.com · 2018.12.23