dredge for a needle in the sea
Looking for a needle under the water, a Chinese idiom, Pinyin Shu ǐ D ǐ L ā ozh ē n, means fishing for a needle under the water. It comes from Er Lang Shou Zhu Ba Jie by Wu Changling of Yuan Dynasty.
The origin of Idioms
In Yuan Dynasty, Wu Changling's "Er Lang Shou Zhu Ba Jie": Juner Fu looks like looking for a needle in the sea. Marriage is coming. How can he disappear without fate? Until now.
Idiom usage
It means to work in vain. I don't know when I'll get it. How can I be the daughter of a family. ——Awakening the world by Feng Menglong of Ming Dynasty Volume 9
dredge for a needle in the sea
be a bully under the protection of a powerful person - gǒu bàng rén shì
If there are many soldiers, they will lose - bīng duō zhě bài
decision making through operations research - yùn chóu jiàn cè