HSK 7-9
纸上谈兵
zhǐshàng-tánbīnglit. military tactics on paper (idiom); fig. theoretical discussion that is worse than useless in practice; armchair strategist; idle theorizing
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.