a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in tranSIstors
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);
"Today the United States is the only country in the world not totally committed to the Systeme International d'Unites"
the syllable naming the seventh (subtonic) note of any muSIcal scale in solmization
The SI unit of magnetic flux equal to the magnetic flux that in linking a circuit of one turn produces in it an electromotive force of one volt as it is uniformly reduced to zero within one second. 韦伯磁通量的国际单位，等于当磁通量在一秒钟内被统一地减弱为零时在它联接的一圈电路内产生一伏特电动势时的磁通量
