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Short-Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2022
Short-Term Investments [Abstract] |
Schedule of Short-term investments | Short-term investments consisted of the following:
|  | As of December 31, |
|  | 2021 |  |  | 2022 |
|  | US$ |  |  | US$ |
Aggregate cost |  |  | 2,764,244 |  |  |  | 25,547,079 |
Gross unrealized gain |  |  | 142,100 |  |  |  | 241,225 |
Aggregate fair value |  |  | 2,906,344 |  |  |  | 25,788,304 |

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