Ji, what, what idiom?

Good luck: good luck, extended to good luck, success or failure; Divination, extended to prediction. Whether this is a blessing or a curse, success or failure, is unpredictable. As predicate and object; It means unpredictable is a blessing or a curse.

Cai's Biography of Yue Quan replied on the 59th: "How dare a saint invite me to Beijing? However, the treacherous court official is in the DPRK, and his good or bad luck is uncertain. "

Wang Shuo's Xu Ye: "At that time, the boy monitor with the best and most beautiful academic performance in our class knew at a glance that good or bad luck was uncertain."

Other idioms: all the best: all the best; Safe and sound. Soldier without a blood blade: A soldier without a blood blade. Refers to a smooth war and victory without confrontation or fierce fighting. Good luck: Very auspicious and smooth. Used for divination and blessing in the old days. Have you ever had one? Never.