托福写作满分范文中对于我们备考期间的考生有可以汲取的内容，比如结构划分，逻辑顺序等等，所以北京新航道建议同学们适当的积累和学习写作范文对成绩是有效的。下面一篇范文就是围绕“海水盐度”展开的写作。

　　托福(TOEFL)考试写作范文赏析:海水盐度

　　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. 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.

　　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. Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff.

　　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.

　　以上就是北京新航道为同学们整理的“托福写作范文赏析之海水盐度”的相关内容，本文中一些精彩的句子还是很有参考价值的。资料请继续关注新航道官方网站。