名詞 rule of thumb:

1. a rule or principle that provides guidance to appropriate behavior
   同義詞：guidepost, guideline

1. I never weigh anything when I'm cooking-I just do it by rule of thumb.
   我烹飪從來不稱重量——只是憑經(jīng)驗下料。
2. I never weigh anything when I'm cooking.I just do it by rule of thumb.
   我做飯時從來什么也不稱量，只是根據(jù)實際經(jīng)驗估量做。
3. As a rule of thumb, a one-cent-a-gallon gasoline tax raises$1 billion. Oil producers in President-elect Bush's adopted state of Texas, however, would rather see a tax on imported crude oil.
   一般情形是，每加侖加汽油一分錢的稅可以征收10億元?？墒?，在布什第二家鄉(xiāng)德克薩斯州的產(chǎn)油商寧愿看見在進口原油上征稅。
4. As a rule of thumb, you should cook a chicken for 20 minutes for each pound that it weighs.
   憑經(jīng)驗估計，每磅雞肉應烹調20分鐘。