international system of units [经] 国际通用单位制
international system of units[ noun ]
a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela)
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Today the United States is the only country in the world not totally committed to the Systeme International d'Unites