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Intangible Asset (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Intangible Asset |
Schedule of intangible asset | ​
​ | ​ | ​
​ |  | Total
​ | ​ | RMB
Balance as of January 1, 2018 |  | —
Addition |  | 2,852,370
Amortization |  | (491,069)
Foreign currency translation difference |  | 218,037
Balance as of December 31, 2018 | ​ | 2,579,338
Amortization | ​ | (619,733)
Foreign currency translation difference | ​ | 34,687
Balance as of December 31, 2019 |  | 1,994,292
Schedule of estimated annual amortization expense | ​
​ | ​ | ​ | ​ | ​
​ |  | Amortization
​ | ​ | RMB | ​ | US$
2020 |  | 629,233 |  | 90,384
2021 |  | 627,514 |  | 90,137
2022 |  | 627,514 |  | 90,137
2023 |  | 110,031 |  | 15,805

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