a hard nut to crack

释义

难以应付的问题或情况；难以说服或影响的人；难事；难题

[A hard nut to crack]
A Hard Nut to Crack
A hard nut to crack
A Hard Nut to Crack: The Protection of Technological Measures
The lymph follicle: a hard nut to crack
Speciation of Se in Bertholletia excelsa (Brazil nut): a hard nut to crack?
Work-ability evaluation: A piece of cake or a hard nut to crack?
Nutrition: a hard nut to crack. An exploration of the knowledge, attitudes and activities of qualified nurses in relation to nutriti...
A hard nut to crack: a review of the Australian macadamia nut industry.
A hard nut to crack! Implementing supply chain sustainability in an emerging economy
Association of minor and trace elements with mineralogical constituents of urinary stones: a hard nut to crack in existing studies o...
The giant common duct stone: still a hard nut to crack.
Brazil and tobacco use: a hard nut to crack.