MG

名词 mg:

1. one thousandth (1/1,000) gram
   同义词：milligram
2. a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine)
   同义词：magnesium, atomic number 12