Noun:

1. a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures

Adjective:

1. liable to sudden unpredictable change;

   "erratic behavior"
   "fickle weather"
   "mercurial twists of temperament"
   "a quicksilver character, cool and willful at one moment, utterly fragile the next"
   

mercuryn.水银；（M~）水星；精神

mercurialadj.善变的；活泼的；水银的；[天文]水星的n.水银剂

volatileadj.不稳定的；反复无常的；易挥发的n.挥发物

changeableadj.易变的；可改变的

inconstantadj.易变的；无常的

unpredictableadj.不可预知的

unstableadj.不稳定的；易变的

erraticadj.古怪的；飘忽不定的；不稳定的

fickleadj.变幻无常的；易变的

HG=Hand Generator 手摇发电机

hydrargyrumn.汞

1. Mirrors have a backing of quicksilver.
   镜子以水银作底。

1. Her quicksilver nature had been a constant concern to her parents in the past.
   她好感情用事，这曾使她父母牵肠挂肚。