ReadWriteQuiz
Chinese dictionary
derogall talk and no action; be an armchair strategist; fight only on paper
我们最不需要的是纸上谈兵的评论家发表的“智慧”言论。
The last thing we need are words of wisdom from an armchair critic.
这种做法不啻为纸上谈兵。
That approach applies rather better in theory than in practice.