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Segment Information (Tables)
6 Months Ended
Jun. 30, 2021
Segment Information  
Schedule of non-current assets based on geographical location of the assets

    

As of December 31, 

    

As of June 30, 

2020

2021

US$

US$

PRC

 

26,560,143

 

6,406,133

USA

 

2,158,359

 

1,668,746

Total

 

28,718,502

 

8,074,879