緣木求魚的英文：
[Literal Meaning]
climb/tree/look for/fish
One climbs a tree to catch fish.

[解釋]
方向或辦法不對，不可能達到目的。

[Explanation]
a fruitless approach

[例子]
如果只想通過理論計算來解決這個問題就等于緣木求魚，你需要做實驗。

[Example]
If you want to solve this problem only by theoretical computing, it is a fruitless approach. What you need to do is to do experiments.

[英文等價詞]
to fish in the air
milk the bull
milk the ram
skin a razor

參考例句：
  • To get water from a flint
    緣木求魚

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