However, there exist some problems worth our thinking.
但尚存在一些需要思考的问题。
But it is no doubt that there still exist some problems.
但不可否认，这其中也存在不少的问题。
But this system in the process of implementation also exist some problems to solve.
但这一制度在实施的过程中也存在着一些亟待解决的问题。
But this system in the process of implementation also exist some problems to solve.
但这一制度在实施的过程中也存在着一些亟待解决的问题。
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