1 feet = 12inches
1 yard = 3 feet
1 square feet =144 square inches
(F-32)*5/9=C (F :Fahrenheit temperature(华氏温度), C: Celsius temperature(摄氏温度))
1 lb(pound) =0.45 kg; 1kg = 2.20 lb
1 gallon (gal) =4 quarts (qt.) = 8 pints (pt.)
1 dollar = 100cents
1 quarter = 25cents
1 dime = 10 cents
1 nickel = 5cents
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