rule of thumb
經驗法則、經驗守則，指一種基于實踐或經驗的快速決策或評估方法
口語·描述經驗法則
英文釋義
a practical principle or guideline based on experience or common sense, rather than strict rules or scientific measurements
例句
As a rule of thumb, add one teaspoon of salt per liter of water.
典故來源
源于木匠用拇指寬度粗略測量的傳統，后泛指基于經驗而非精確計算的實用法則。