拼音缩写是「nsn」的词

解释 ◎ 难上难，难上加难 nánshàngnán,nánshàng-jiānán [Alps on Alps;extremely difficult] 形容极端的难度 读音：nán shàng nán，nán shàng jiā nán

◎ 难上难，难上加难 nánshàngnán,nánshàng-jiānán[Alps on Alps;extremely difficult] 形容极端的难度 读音：nán shàng nán