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Short-term Investments

12 Months Ended

Dec. 31, 2021

Short-term Investments [Abstract]

Short-term Investments

3. SHORT-TERM INVESTMENTS

Short-term investments consisted of the following:

		As of December 31,
		2020				2021
		US$				US$
Aggregate cost			766,295				2,764,244
Gross unrealized gain			—				142,100
Aggregate fair value			766,295				2,906,344

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Short Term Investments Disclosure [Text Block] .

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