a hard nut to crack

 ťažko riešiteľný problém, tvrdý oriešok

1. I find this a very hard nut to crack. BNC

2. In other words, though the UK may be a hard nut to crack, Christians are better positioned than any grouping other than Muslims to effect change here in an understanding of and commitment to strengthening the poor. BNC

3. A company whose product has sold well in the States may find the European market a hard nut to crack. CIDoI

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