thorny [ˈθɔ:rni]

例句:

• I have a sharp tongue and a thorny exterior.
  来自fig.
• The young captain is pondering over a thorny problem.
  年轻的上尉正在思考一个棘手的问题.
  
• The roses are thorny. Take care not to prick your hands.
  玫瑰有刺,小心扎手.
  
• The boys argued over the thorny points in the lesson.
  孩子们辩论功课中的难点.
  
• But then we also open up a thorny rights issue.
  来自BBC
• What to do about them is the really thorny question.
  来自SA