thorny没有词根。

adj. 多刺的痛苦的令人苦恼的

This thorny question has troubled me for several days.

这个棘手的问题困扰了我好几天。

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。

The thorny problem of chronic procrastination.

慢性拖延，一个棘手的问题。