necessary evil

necessity (quality or state of being necessary, unavoidable, or absolutely requisite)

gold / metal

metal / money / firmness, strength / completely, entirely

(archaic) gold

gold / gold or metal currency: coins, such as 大判 (ōban) or 小判 (koban) / short for 黄金色 (kogane iro, “gold”, the color)

money / metal

one of the five classical elements in traditional Chinese philosophy and medicine: see the "Wu Xing" entry on Wikipedia

Jin dynasty (1115–1234)

oral exam