二氧化硫是一种污染物，并且是形成酸雨的主要因素。
Sulphur dioxide is a pollutant and a major contributor to acid rain.
简略地说，导致精神病的原因看起来主要有三种。
In crude terms , the causes of mental illness seem to be of three main kinds.
英美烟草和大米这两种主要商品的出口商，两项重大让步减轻了它们的负担。
Anglo-American exporters of tobacco and rice—the chief commodities affected by enumeration—had their burdens reduced by two significant concessions.
因此，从多样性的角度来看，将一种主要捕食者从一个群落中彻底消灭通常是一个错误。
Therefore, from the stand point of diversity, it is usually a mistake to eliminate a major predator from a community.
现在，非洲最大的经济体正面临着一场粮食危机，非洲主要的番茄田被一种昆虫毁坏，导致全国范围内的番茄短缺，番茄价格不断上涨。
Now, Africa's largest economy is facing a food crisis as major tomato fields have been destroyed by an insect, leading to a nationwide shortage and escalating prices.
在第一种情况下，雄性竞争和性内选择产生相对简短的鸣声，主要用于地盘行为。
In the first, male competition and intrasexual selection produce relatively short, simple songs used mainly in territorial behavior.
这一种趋势被认作二十世纪自然史展现中的主要发展之一。
This particular trend is regarded as one of the major developments in the presentation of natural history in the twentieth century.
主要目的是营造一种家庭般令人放松的感觉，因此航空公司倾向于使用柔和的颜色，给人一种像家一样的、自然而朴实的感觉。
The principal aim is to create a home-like relaxing feel, so airlines tend to use soft colors that feel domestic, natural and earthy for that reason.
批判性社会研究中融入了两种主要的结构主义分析技巧。
There are two main structuralist techniques incorporated into critical social research.
实施软销售的一种方法是提供信息，暗示广告商希望消费者得出的主要结论，但不明示结论本身。
One way to implement the soft-sell approach is to provide information that implies the main conclusions the advertiser wants the consumer to draw, but leave the conclusions themselves unstated.
动物在寒冷的冬天有三种主要的生存方式：休眠、适应或迁徙。
There are three main ways that animals survive the cold in winter: sleep, adapt or migrate.
全新的商业模式正出现；报告的作者确定了三种主要的商业模式。
Entirely new business models are emerging; three main ones were identified by the report's authors.
共生关系主要有三种类型：寄生关系、共生关系和互惠关系。
There are three main types of symbiotic relationships: parasitism, commensalism, and mutualism.
研究人员发现了七种主要的适应性反应，包括增加流动性、永久定居点的搬迁、维持生计的食物的变化以及依赖与其他群体的贸易。
The researchers identified seven major adaptive responses, including increased mobility, relocation of permanent settlements, changes in subsistence foods, and reliance on trade with other groups.
不管毛发是用来做什么的，也不管它在人体的哪个部位，它都主要由一种叫做角蛋白的蛋白质组成。
Now hair, whatever it is for and wherever it is on the human body, is composed mainly of a protein called keratin.
一种观点是，像你说的那样，主要的天气模式如厄尔尼诺现象，才是罪魁祸首。
One idea is as you suggest that major weather patterns, something like El Nino, are responsible.
二氧化硫是酸雨的主要成因之一，它是一种特别严重的污染物，因为它会降低呼吸系统处理其他污染物的能力。
Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system's ability to deal with all other pollutants.
颜色的变化是由章鱼皮肤上的两种不同的细胞造成的，主要是皮肤表面的色素细胞。
The color changes are executed by two different kinds of cells in the octopus' skin, mainly by color cells on the skin's surface call chromatophores.
高速公路隔声屏障作为一种经济有效的方法，是降低交通噪声的主要措施。
As an economical and effective method, the expressway noise barrier is a primary measure to reduce traffic noise.
第二种，更有可能的解释是，古埃及极端干燥的气候是主要原因，因为干燥促进了有机遗骸的保存。
A second, more likely, explanation is that the extremely dry climate of ancient Egypt was largely responsible, given that dryness promotes the preservation of organic remains generally.
我们经常认为绘画需要天赋，但这种想法源于我们的错误分类——绘画主要是一种艺术形式，而不是一种学习工具。
We often think of drawing as something that takes inborn talent, but this kind of thinking stems from our misclassification of drawing as, primarily, an art form rather than a tool for learning.
韩国科学家将炉甘石洗液的主要成分转化成一种微细的材料，这种材料能够将声波转化成电能。
Scientists from Korea have turned the main ingredient of calamine lotion into a tiny material that converts sound waves into electricity.
年轻的叙述者说，每个人都怀疑自己至少有一种主要的美德。
The youthful narrator remarks that everybody suspects himself of having at least one of the cardinal virtues.
但对于排名居中且有排名意识的学校来说，奖学金主要是一种用来招募顶尖学生并提高其学校学术收益的工具。
But for rankings-conscious schools in between, merit aid has served primarily as a tool to recruit top students and to improve their academic profits.
他以及其他科学家表示，现在主要有两种替代化石燃料的选择，即用可再生能源产生能量或采用核能。
He and other scientists say there are basically two options to replacing fossil fuels, generating energy with renewables, or embracing nuclear power.
事实上，水坝主要是应对水位年变化的一种策略。
In fact, dams are primarily a strategy for dealing with annual variations in water levels.
阿伦德陨星里的陨石球粒和内含物是由球粒陨石基质结合到一起的；这是一种细粒混合物，主要包括铁颗粒和硫化铁的硅酸盐矿物。
Chondrules and inclusions in Allende are held together by the chondrite matrix, a mixture of fine-grained, mostly silicate minerals that also includes grains of iron metal and iron sulfide.
这种结合不对称、解剖学和偶然性的进化论机制并未提供一种充分的解释，以说明蜗牛的右旋何以会成为主要的旋向。
This evolutionary mechanism combining dissymmetry, anatomy, and chance does not provide an adequate explanation of why right-handedness should have become predominant.
大约4万6千年前，在一种使用工具、高度智能的捕食者入侵后不久，澳大利亚主要的陆地生物发生了一些巨大的变化。
Something dramatic happened to Australia's dominant land creatures—somewhere around 46,000 years ago, strikingly soon after the invasion of a tool-wielding, highly intelligent predator.
大约4万6千年前，在一种使用工具、高度智能的捕食者入侵后不久，澳大利亚主要的陆地生物发生了一些巨大的变化。
Something dramatic happened to Australia's dominant land creatures—somewhere around 46,000 years ago, strikingly soon after the invasion of a tool-wielding, highly intelligent predator.
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