33. The hydrologic cycle,a major topic in this science,is the complete cycle of phenomena through which water passes,beginning as atmospheric water vapor,passing into liquid and solid form as precipitation,thence along and into the ground surface,and finally again returning to the form of atmospheric water vapor by means of evaporation and transpiration.
水文循环,作为该学科中的一个主要课题,指的是水所经过的诸现象的整个循环过程,开始时是作为大气中的水蒸气,转而作为雨、雪、露、雹一类的降水量经过液体和固体形态,由此而沿着地层表面分布或进入地层表面,最终通过蒸发和散发作用再度回复到大气水蒸气的形态。
34. Only when a system possesses natural or artificial boundaries that associate the water within it the hydrologic cycle may the entire system properly be termed hydrogeologic.
只有当一个系统拥有自然的或人工形成的边界来把边界中的水与水文循环联系起来的时候,才有可能把整个的系统恰当的成为与水文地质学有关。
35. The historian Frederick J. Turner wrote in the 1890 s that the agrarian discontent that had been developing steadily in the United States since about 1870 had been precipitated by the closing of the internal frontier that is,the depletion of available new land needed for further expansion of the American farming system.
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