quick silver

名词 quick silver:

1. a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures
   同义词：mercury, quicksilver, hydrargyrum, Hg, atomic number 80

形容词 quick silver:

1. liable to sudden unpredictable change
   同义词：erratic, fickle, mercurial, quicksilver