Dual citizenship is a thorny issue.

双重国籍向来是个棘手问题。

Then there is the thorny issue of trade.

然后就有了棘手的贸易问题。

Then there is the thorny issue of privacy.

还有令人伤脑筋的隐私问题。

Technology transfer will also be a thorny issue.

技术转让也将是棘手的问题。

Design or market research is always a thorny issue.

设计或市场调查一直是一个棘手的问题。