参见SI手册英文版
The metre is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.
米是光在真空中1／299792458秒的时间间隔内所经路程的长度。
[根据1983年10月第十七届国际计量大会通过了米的定义]
The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram.
国际千克原器的质量。
[根据第1届国际计量大会（1889）和第3届国际计量大会（1901）]
The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.
秒是铯 -133 原子基态的两个超精细能级之间跃迁所对应的辐射的 9 192 631 770 个周期的持续时间。[根据第13届国际计量大会（1967），决议1]
The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 x 10 –7 newton per metre of length.
在真空中，截面积可忽略的两根相距 1 m 的无限长平行圆直导线内通以等量恒定电流时，若导线间相互作用力在每米长度上为 2 × 10 -7 N ，则每根导线中的电流为 1 A 。
[国际计量委员会（1946）决议2。第9届国际计量大会（1948）批准]
The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
开尔文：水三相点热力学温度的 1/273.16 。
[第13届国际计量大会（1967），决议4]
The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is "mol".
When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles.
摩尔是一系统的物质的量，该系统中所含的基本单元数与0.012 kg 12 C的原子数目相等。
在使用摩尔时，基本单元应予指明，可以是原子、分子、离子、电子及其他粒子，或这些粒子的特定组合。
[第14届国际计量大会（1971），决议3]
The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 10 12 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.
坎德拉：是一光源在给定方向上的发光强度，该光源发出频率为 540 × 10 12 Hz 的单色辐射，且在此方向上的辐射强度为（ 1/683 ） W/sr 。[第16届国际计量大会（1979），决议3]