marginal cost curve的用法和樣例：
例句
- Changes that increase productivity will shift the average and marginal product curves upward and the average and marginal cost curves downward.
生產率增加會使平均產量和邊際常量曲線向上移動，而平均成本和邊際成本曲線會向下移動。 - Outside China, at any rate, a producer smelts or sinks according to its position on aluminium's cost curve.
無論如何，中國境外的生產者需要根據鋁成本曲線的位置點來選擇熔煉或者放棄。
