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1·There are many who argue that corn ethanol should replace fossil fuel gas as the primary source for running cars.

许多人认为，玉米乙醇应该取代化石燃料气体，成为汽车的主要燃料。

2·Parallel rails had long been used in mining operations to move bigger loads, but horses were still the primary source of power.

在采矿作业中，平行铁轨早已被用来运送大件的货物，但马匹仍然是主要的运输工具。

3·Wood, the primary source of heat for homes and industries and also used in the iron industry as processed charcoal, was diminishing in supply.

木材是家庭和工业的主要热源，也以加工木炭的形式用于铁工业，它的正在减少。

4·Virtual goods have become the company's primary source of profits.

网络虚拟物品成为这家公司最大的利润来源。

5·The United States will remain the primary source of clean-energy innovation.

美国将依然保持清洁新能源的主要输出国地位。

6·The primary source of his identity is who he is—his father and his birthplace.

帕普的身份的主体是他的父亲和他的出生地。

7·The course is based on careful readings of primary source documents, with commentaries.

本课程需要对基本阅读材料进行仔细的阅读，然后进行评论。

8·It`s best to consume organic vegetables and fruits as your primary source of alpha-carotene.

最好以有机蔬菜和水果作为α-胡萝卜素的首要来源。

9·Farming is the only or primary source of income for more than three-quarters of the world's poor.

世界上有四分之三以上的贫困人口以农业作为唯一的或主要的收入来源。

10·That means the money raised in the IPO will become the primary source of fresh capital for lending growth.

这意味着，IPO中筹得的资金将成为其新增贷款增长的主要来源。