​

​

As of

​

As of

​

As of

​

  ​ ​ ​

December 31, 

  ​ ​ ​

June 30,

  ​ ​ ​

June 30,

​

​

2025

​

2026

​

2026

​

​

RMB

​

RMB

​

US$

Balance at the beginning of the period

620,000

40,942

6,034

Decrease in contract liabilities from recognizing revenue during the period included in the contract liabilities at the beginning of the period

​

(620,000)

​

(40,942)

​

(6,034)

Increase in contract liabilities from billings in advance of performance obligation under contracts

40,942

625,320

92,161

Balance at the end of the period

40,942

625,320

​

92,161