rule of thumb
经验法则、经验守则，指一种基于实践或经验的快速决策或评估方法
口语·描述经验法则
英文释义
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.
典故来源
源于木匠用拇指宽度粗略测量的传统，后泛指基于经验而非精确计算的实用法则。