opportunity costs短语¹³¹⁶²⁰⁺³ 基本英英例句 机会成本原型opportunitycost的复数 名词 opportunity cost: cost in terms of foregoing alternativesThey have tended to assume increasingopportunity costs.他们往往假定机会成本是递增的。 The alternative forgone is called the opportunity cost.这种选择性的放弃就叫做机会成本。