quicksilver ['kwɪksɪlvə(r)]

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附加级

n. 水银, 汞 adj. 极快的, 反复无常的

Mirrors have a backing of quicksilver. 镜子有水银作底。
By heaven, they ought to be worked in quicksilver mines. 但愿苍天有眼，让他们到水银矿上去作苦工。