GRE阅读考试难句解读（四）

　　22.In the periods of peak zooplankton abundance，that is，in thelate spring and in the summer，Haney recorded maximum daily com-munitygrazing rates，for nutrient-poor　lakes and bog lakes，respectively，of 6.6percent and 114 percent of daily phytoplankton production.

　　在浮游动物数量激增的高峰期，亦即在春季后期以及夏季，哈尼记录了最大程度上的每日群落食草比率，对于营养物不充足的湖和沼泽湖而言，分别为每日浮游植物繁殖量的6.6%和114%.

　　23.The hydrologic cycle，a major topic in this science，is thecomplete cycle of phenomena through which water passes，beginning asatmospheric water vapor，passing into liquid and solid form asprecipitation，thence along and into the ground surface，and finallyagain returning to the form of atmospheric water vapor by means ofevaporation 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。

　　24.The historian Frederick J. Turner wrote in the 1890s that theagrarian discontent that had been developing steadily in the UnitedStates since about 1870 had been precipitated by the closing of theinternal frontierthat is，the depletion of available new land　neededfor further expansion of the American farming system.

　　史学家弗雷德里克杰特纳于十九世纪九十年代著述道，美国约自18世纪70年代以来一直在持续不断发展的农民不满，由于国内边远地区的封闭而更趋加剧亦即是说，美国农业系统进一步扩展所必需的可资利用的新土地几近耗竭。

　　25.In the early 1950s，historians who studied preindustrial Europe began， for the first time in large numbers，to investigate moreof the preindustrial European population than the 2 or 3 percent whocomprised the political　and social elite：thekings，generals，judges，nobles，bishops，and local　magnates who hadhitherto usually filled history books.

　　二十世纪五十年代早期，研究前工业化时代欧洲的史学家，首次以众多的人数，开始调查前工业化时代欧洲人口中的大多数，而非那些构成了政治与社会精英阶层的百分之二或三的人口，即国王、将军、法官、贵族、主教、以及地方上的达官显贵，而正是这部分人一直到那时为止普遍充斥于史学著作。

　　26.Historians such as Le Roy Ladurie　have used the documents toextract case　histories， which have illuminated the attitudes ofdifferent social groups and have revealed how theauthorities administered justice.

　　象勒罗伊拉迪里一类的史学家利用这些文献史料从中挖掘出某些个案史来，阐明了不同社会群体的态度，并揭示出当局是如何执行审判的。