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difficult problem
difficult (/thorny)question
difficult problem;hard nut to crack两国关系中的～不是我们出的。The difficulties existing in the relations of our two countries were not created by us./出～set (or pose) difficult questions;put sb in an awkward position
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。