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7. PAYABLES AND ACCRUED EXPENSES (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Salary payable $ 310,097 $ 241,343
Social security insurance contribution payable 105,750 140,326
Other payable-related party (see Note 8) 89,424 90,900
Deposit on subscription of a subsidiary's share 144,798 0
Accrued expense for construction 97,913 104,246
Accrued expense - others 358,066 328,443
Total $ 1,106,048 $ 905,258