patio process
A surname from Norman.
(mining, historical) A boy employed to convey coal to wagons in the working place.
a basic standard by which values are measured
(historical) A process that uses mercury amalgamation to extract silver from ore.
鉱山博物館の展示は、植民地時代のアメリカで水銀アマルガム法が銀の生産をどのように革新したかを説明していた。
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