Race relations in the US continue to be a thorny problem.
美国的种族关系一直是棘手的问题。
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 so-called "puppy love" problem is a thorny issue for all teachers.
老师们大都把早恋看作一个棘手的问题。
The shadow banking system poses a thorny problem too.
影子银行同样让人头疼。
Race relations in the US continue to be a thorny problem.
对于美国来说，一直以来，种族关系恰似如鲠在喉。
Race relations in the US continue to be a thorny problem.
对于美国来说，一直以来，种族关系恰似如鲠在喉。
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