ORE 1.3 support for Chinese characters?

I'm using ORE 1.3 on Linux, and my database tables have some fields containing Chinese string values. These Chinese string can be displayed correctly in Oracle SQL Developer, but in ORE 1.3 when I pull data into a data.frame, they are displayed as '????'. It is the same when I use ORE 1.3 Windows client. I know that R itself can process Chinese characters correctly. So I wonder if ORE 1.3 connections can process Chinese and how to. Thanks!

Does anyone know how to solve this problem?

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