新概念英语新概念英语文章精选.docxVIP

美联英语提供：新概念英语——新概念英语文章精选两分钟做个小测试，看看你的英语水平/test/xiaobai.aspx?tid=16-73675-0随着《新概念英语》这套教材的引入，已经在全国都引起了轰动乃至学习新概念的潮流。小编带来的新概念英语文章精选，欢迎阅读!　　新概念英语文章精选1　　The Salinity of Ocean Waters　　海水盐度　　If the salinity of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are important.　　如果我们分析海水的盐度，会发现地区间只有轻微的变化，然而有些小的变化是重要的。　　There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation -- conversion of liquid water to water vapor. In this manner the salinity is increased, since the salts stay behind. If this is carried to the extreme, of course, white crystals of salt would be left behind.　　导致海洋的盐度变化的基本过程有三个，其中之一是通过蒸发的方式即把液态水转化为水蒸气来减少海洋中的水分。这样由于盐留了下来，所以盐度增大。当然，如果这种方式走向极端，将会余下白色的盐晶体。　　The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean.　　与蒸发相反的是降水，如降雨，由此水被加入海中，海水被稀释，从而盐度降低。这种情形会发生在大量降雨的地区，或江河入海岸处。　　Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff.　　因此，盐度通过蒸发减少水分而上升或通过降水或径流增加淡水成分而下降。　　Normally, in tropical regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.　　一般来说，在阳光很强烈的热带地区，海水的盐度略高于世界上其它没有热带那样多的蒸发的地区。同理，在江河稀释海水的海岸地带，海水盐度略低于其它海区。　　A third process by which salinity may be altered is associated with the formation and melting of sea ice. When sea water is frozen, the dissolved materials are left behind. In this manner, sea water directly beneath freshly formed sea ice has a higher salinity than it did before the ic