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LEASE (Schedule of Estimated Annual Amortization Expenses) (Details) - Dec. 31, 2020
¥ in Thousands, $ in Thousands
CNY (¥)
USD ($)
LEASE    
2021 ¥ 9,621 $ 1,475
2022 9,621 1,475
2023 9,621 1,475
2024 9,621 1,475
2025 ¥ 9,621 $ 1,475