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Short-term Investments (Tables)

12 Months Ended

Dec. 31, 2019

Short-term Investments

Schedule of Short-term investments classification

​

​	​	​	​	​	​	​
​	​	As of December 31,
​	​	2018	​	2019	​	2019
​	​	RMB	​	RMB	​	US$
Debt securities:	​	​	​	​	​	​
Held-to-maturity		7,630,689		34,481,053		4,952,893
Trading		—		795,849		114,317
Equity securities:	​	​	​	​	​	​
Marketable		—		11,925		1,713
​		7,630,689		35,288,827		5,068,923

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Tabular disclosure of short term investments.

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