纸上谈兵

zhǐshàng-tánbīng

lit. military tactics on paper (idiom); fig. theoretical discussion that is worse than useless in practice; armchair strategist

HSK 3.0 · Band 7 trad. 紙上談兵

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别只会纸上谈兵。

Do not just talk on paper.

纸上谈兵要不得。

Armchair talk will not do.