Hello智 齐
Apologize for the late reply.
If you are currently using Remote Desktop on Mac OS 10.9.0, there was a software issue regarding copy and paste functionality.
However, this issue has been successfully resolved. You can update your software to the latest version or alternatively, give the Beta version a try.
Here is the download link for Beta version: App Center
I apologize once again for any inconvenience this may have caused.
Best regards,
Karlie Weng