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1·The present tariff structure was formed in 1976 based on Pricing Regulation for Electricity and Heat.

我国现行目录电价结构是在1976年国家颁布的《电热价格》基础上形成的。

2·A water tariff structure with step-wise increase or decrease of the price per unit water from one block to the next.

一种水价结构，水的单价从一个水量段到下一个水量段逐步增加或者减少。

3·The effect of a tariff, therefore, is to change the structure of American production.

因此，关税的作用是改变美国的生产结构。