I know that building an effective patent and trademark system is not easy -- because over 200 years after its founding, the United States is still working to perfect its own.

 
  • 我知道,建設一套行之有效的專(zhuān)利商標體系并不容易,因為在建國200多年后的今天,美國仍在努力完善自己的專(zhuān)利商標體系。
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