1.income tax 所得税

例句:I wouldn't be in favour of income tax cuts.
我不会支持削减所得税。

2.economic policy 经济政策

例句:His administration's economic policy would focus on reining in inflation
他的政府的经济政策将侧重于控制通货膨胀。

3.marginal cost 边际成本

例句:For analytical purposes, it is more important to focus on the marginal revenue and marginal cost curves.
从分析的目的上来说，关注边际收益和边际成本曲线会更重要些。

4.act as 扮演

例句:The tough new law should act as a deterrent.
这项严厉的新法将起到威慑作用。