| 释义 |
a rule of thumb rule of thumbAn approximation; a suggested method or guideline. A good rule of thumb is to plant your seedlings around the end of May.See also: of, rule, thumba rule of thumb COMMON 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. See also: of, rule, thumba rule of ˈthumb a 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.See also: of, rule, thumb |