Storing/Retrieving Chinese/Unicode in PL/SQL
You can not store Chinese characters in a Western European characterset (WE8ISO8859P1).

Define the MANUFACTURER_ADDRESS_LINE column as NVARCHAR2 to use AL16UTF16 and insert the string as below (notice the N modifier):

INSERT INTO tc(MANUFACTURER, MANUFACTURER_ADDRESS_LINE ) 
SELECT 'Neal Chinese Test 06', N'统一通信系统）【功能性备注：集团电话' FROM DUAL;
commit;