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Idiom riddle: sweeping snow and blocking wells

In vain?

[Pinyin]

Leonel Woogon

[Interpretation]

It took effort, but it didn't work.

[source]

"Guanzi Situation": "No, no, I don't know, it's in vain."

[example]

I didn't expect that I went to Europe and didn't make a deal. It's a waste of effort.