| 词组 | a rule of thumb |
| 释义 | Idiom a rule of thumb a way of calculating something which is not exact but which will help you to be correct enough.A good rule of thumb is to cook two handfuls of rice per person. rule of thumbAn approximation; a suggested method or guideline. A good rule of thumb is to plant your seedlings around the end of May. a rule of thumbCOMMON A rule of thumb is a general rule about something which is right in most cases. As a rule of thumb, drink a glass of water or pure fruit juice every hour you are travelling. A good rule of thumb for any type of studio photography is to use no more light sources than are strictly necessary. Note: This expression probably dates back to the use of the first joint of the thumb as a unit of measurement. a rule of ˈthumba quick, practical, but not exact, way of measuring or calculating something: As a rule of thumb you need a litre of paint to every 12 square metres of wall.This phrase may come from the fact that people often used their thumbs to estimate measurements. |
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