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 international system of units 添加此单词到默认生词本
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    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)
    <noun.quantity>
    Today the United States is the only country in the world not totally committed to the Systeme International d'Unites


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