explain bitcoin in simple terms, Knowledge graph

5. New energy sources: BYD, Contemporary Amperex Technology Co., Limited, Longji Green Energy and Goldwind Technology.10. Non-bank finance: China Ping An, China Life Insurance, CITIC Securities, Bank of China, China Merchants Bank, Huatai Securities and Oriental Fortune.3. Medicine: Hengrui Pharma, China Resources Sanjiu, Pianzi epilepsy, Yunnan Baiyao, WuXi PharmaTech.

5. New energy sources: BYD, Contemporary Amperex Technology Co., Limited, Longji Green Energy and Goldwind Technology.A-share core quality assets:6. Traditional energy sources: China Petroleum, China Petrochemical, China CNOOC and China Shenhua.

7. Electricity: Changjiang Power, Huaneng Hydropower, China Nuclear Power, China Guangdong Nuclear Power and Guodian Power.6. Traditional energy sources: China Petroleum, China Petrochemical, China CNOOC and China Shenhua.A-share core quality assets: