C) Being a major source of animal intelligence.

C） 是动物智力的主要来源。

There are major source of transfats or transfatty acids.

这些是反式脂肪或者反式脂肪酸的主要来源。

Get some exercise, which is a major source of endorphins!

做些运动，运动是内啡肽的重要来源！

In developing countries, flies are a major source of transmission.

在发展中国家, 苍蝇是传播的主要来源。

Among the arriving fish were species that feed on all major food sources.

抵达该区域的鱼类里有一些是以所有主要食物来源为食的。

" Newspapers were a major source of information when we were kids, " Yang said.

“我们小时候，报纸是主要的信息来源，”杨说。

That means trouble for coffee-producing countries where the bean is a major source of income.

这对于盛产咖啡的国家来说是灾难，因为咖啡豆是他们的主要收入来源。

It's crucial for world economies because it's their major source of energy.

这对全球经济至关重要，因为石油是主要的能源来源。

One major source of confusion is the difference between having depression and just feeling depressed.

其中最容易被混淆的概念在于区分患有抑郁症与只是简单的情绪低落。

The UN holds more than 560 multilateral treaties, which are a major source of international law.

联合国拥有 560 多个多边条约，这些条约主要来源于国际法。

A major source of energy comes from the burning of fossil fuels, such as coal and oil.

能源的主要来源是燃烧化石燃料，如煤和石油。

Tourism is a major source of employment and income in many EU countries, such as Greece and Spain.

在希腊和西班牙等许多欧盟国家，旅游业是就业和收入的主要来源。

They say oil continues to be a major source of income, but that other industries are also important.

他们表示，石油仍然是主要的收入来源，但是其他行业也很重要。

Since waste was a major source of contact with infectious pathogens, this change ensures fewer people get infected.

由于废物是接触传染性病原体的主要来源，这一变化使得传染病的发病率得以下降。

There are a lot of fishermen actually because fishing is a major source of income for that city.

事实上，那里有很多渔民，因为渔业是该市的主要收入来源。

Pope Benedict has highlighted unregulated financial capitalism as a major source of tension and confrontation in the world.

教宗本笃五世强调未管制的金融资本主义是全世界紧张和冲突局势的一个主要来源。

So, it could be the major source of income or the major source of support.

因此，它可能是主要的收入来源或主要的支持来源。

More specifically, their burps, a major source of methane.

更具体地说，它们的打嗝是甲烷的主要来源。

Display is one of the major sources of power consumption.

显示器是功耗的主要来源之一。

Also a major source of heart disease will be eliminated.

心脏病的主要来源也将被消除。