[纸上谈兵 / 紙上談兵, zhǐ shàng tán bīngㄓˇ ㄕㄤˋ ㄊㄢˊ ㄅㄧㄥ] lit. military tactics on paper (成语 saw); fig. theoretical discussion that is worse than useless in practice (cf. Zhao Kuo 趙括|赵括 leading an army of 400, 000 to annihilation at Changping in 260 BC); an armchair strategist; idle theorizing, See Also: 成语, 趙括, 赵括#40926
[曾经沧海 / 曾經滄海, céng jīng cāng hǎiㄘㄥˊ ㄐㄧㄥ ㄘㄤ ㄏㄞˇ] lit. once experienced the vast ocean(成语 saw); fig. widely experienced in the vicissitudes of life; cf. to have known the world#48688
[倒打一耙, dào dǎ yī páㄉㄠˋ ㄉㄚˇ ㄧ ㄆㄚˊ] lit. to strike with a muck-rake (成语 saw), cf. Pigsy 豬八戒|猪八戒 in Journey to the West 西遊記|西游记; fig. to counter-attack; to make bogus accusations (against one's victim), See Also: 成语, 豬八戒, 猪八戒, 西遊記, 西游记#84956
[花朝月夕, huā zhāo yuè xīㄏㄨㄚ ㄓㄠ ㄩㄝˋ ㄒㄧ] a beautiful day; cf. Birthday of the Flowers on lunar 15th February and Mid-autumn Festival on lunar 15th August#466134
[操斧伐柯, cāo fǔ fá kēㄘㄠ ㄈㄨˇ ㄈㄚˊ ㄎㄜ] (cf. Book of Songs) How to fashion an ax handle? You need an ax; fig. to follow a principle; fig. to act as match-maker