Cheyenne's small size may help; fewer cars travel the roads, and vehicles are a key source of PM 2.5 (and ozone).
夏延城市面积小也有帮助；路上来往的车辆更少，机动车是PM2.5的主要来源。
Fish is also the world's most widely traded foodstuff and a key source of export earnings for many poorer countries.
鱼品也是世界上交易最广的食品，而且是许多较贫穷国家出口收入的一个主要来源。
Cows and oxen are primarily used for dairy production and are a key source of draft power in agricultural production.
奶牛和公牛主要用于乳品生产，是农业生产中的主要畜力来源。
Expanding abroad has become a key source of audience growth for Facebook and MySpace, the largest U.S. social network.
海外用户已经成为美国两家最大的SNS网站Facebook和MySpace最主要的用户增长来源。
Tourism is a key source of income for Nepal, one of the world's poorest countries.
尼泊尔是全世界最贫穷的国家之一，而旅游业则是该国收入的一项重要来源。
Two years age Africa lost more than half its cassava crop — a key source of calories — to the Mosaic virus.
两年前，花叶病毒使非洲损失了超过一半的木薯，而这种作物是当地人的主要食物。
Two years age, Africa lost more than half its cassava crop — a key source of calories — to the Mosaic virus.
两年前，花叶病毒使非洲损失了超过一半的木薯，而这种作物是当地人的主要食物。
Scientists say they have decoded the entire genetic content of the HIV-1 virus, a key source of Aids infection.
科学家称他们已经解码了整个HIV-1病毒的基因内容，这是一个艾滋病传染的关键因素。
More and more enterprises have taken human resources as the core competitiveness and a key source of competitive advantage.
人力资源被越来越多的企业作为其核心竞争力的关键和竞争优势的源泉。
OBJECTIVE:The epidermis stem cell is a key source of skin occurrence repair reconstruction, but its biology function is still not clear.
表皮干细胞作为皮肤发生修复重建的关键源泉，其生物学作用尚不清楚。
This newsweekly, published as a supplement in Aceh's most-widely read newspaper, has become a key source of information in Aceh on reconstruction.
作为亚齐一家发行量最大的报纸的增刊，这份新闻周刊已经成为亚齐重建的重要信息来源。
Recently, scientist have also discovered comets in the main asteroid belt -these main-belt comets might be a key source of water for the inner terrestrial planets.
最近，科学家在主小行星带中也发现了一些彗星——这些主带彗星可能是类地内行星上水的关键来源。
Silica gel production is high water consumption industry and silica gel wastewater has always been a key source of pollution in the field of industrial production.
硅胶生产属于高耗水行业，硅胶废水也是工业生产领域的一个重要污染源。
Caption: Mali, 2001. A tree weathers a sandstorm. The Sahara desert is a key source of dust storms, particularly in the area covering Mauritania, Mali, and Algeria.
描述：2001年，马里，一棵挨过了一场沙尘暴的树。撒哈拉沙漠，特别是毛里塔尼亚、马里以及阿尔及利亚地区，是沙尘暴的主要来源。
This paper analyzes the mechanism of noise generation, and indicates that the source of noise generated from a resonating saw blade is the key source for the noise generation.
分析了圆锯片噪声产生的机理，同时指出共振噪声是圆锯片噪声的重要组成部分。
Composed of 92% water, it is also packed with a giant dose of glutathione which helps boost our immune system. They are also a key source of lycopene - the cancer fighting oxidant.
西瓜中92%是水份，其所含有的大量谷胱甘肽可增加我们的免疫力，同时也是抗癌氧化剂-番茄红素的重要来源。
Composed of 92% water, it is also packed with a giant dose of glutathione which helps boost our immune system. They are also a key source of lycopene - the cancer fighting oxidant.
西瓜中92%是水份，其所含有的大量谷胱甘肽可增加我们的免疫力，同时也是抗癌氧化剂-番茄红素的重要来源。
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