在公制和英制单位之间转换
1 mile = 1.60934 kilometers
1 pound = 0.453592 kilograms
1 gallon (US) = 3.78541 liters
1 inch = 2.54 centimeters
°F = (°C × 9/5) + 32
°C = (°F - 32) × 5/9
K = °C + 273.15