3.adulterate
(v.):to make impure by adding something of less value
參混或劣品而使品質低劣/不純
(e.g.)The concrete used in condtructing the building had been adulterated
by the addition of sea sand.
建造那棟建築物的水泥中,參雜了海沙.
反義:refine; purify
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