纸上谈兵

zhǐshàngtánbīng

HSK 7

纸上谈兵 — zhǐshàngtánbīng

1. lit. military tactics on paper; fig. theoretical discussion that is useless or worse than useless in practice; armchair strategist; idle theorizing

   如果只是纸上谈兵，战争就会失败。 rúguǒ zhǐshì zhǐshàngtánbīng zhànzhēng jiù huì shībài — If it's only armchair strategizing on paper, the war will fail.