2023年剑桥五级词汇汇聚

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剑桥五级词汇篇1

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s by hargrave and geen estimated natural community graz-ing rates by measuring feeding rates ofinspanidual zooplankton species in thelaboratory and then computing community grazing rates for field conditionsusing the known population densityof grazers.

由哈格雷夫和吉恩所进行的研究，对自然前提下的群落食草比例进行了估量，其手段是经由过程测量进场试室内零丁的浮游动物种类的结食比例，然后操作已知的'食草动物种群密度，计较出实地状况下的群落食草比例。

the periodsof peak zooplankton abundance，that is，in the late spring and in the summer，haney recorded maximum daily com-munity grazing rates，for nutrient-poorlakes and bog lakes，respectively，of percent and 114 percent of daily phytoplankton production.

在浮游动物数目激增的高抛却，亦即在春季后期以及夏日，哈尼记实了最大水平上的每日群落食草比率，对于营养物不充沛的湖和池沼湖而言，分袂为每日浮游植物滋生量的%和114%.

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.

水文轮回，作为钙揭捉?科中的一个首要课题，指的是水所经由的诸现象的整个轮回过程，起头时是作为大气中的水蒸气，转而作为雨、雪、露、雹一类的降水量经由液体和固体形态，由此而沿着地层概况分布或进入地层概况，最终经由过程蒸发和散爆发用再度回覆到大气水蒸气的形态。

historian frederick j. turner wrote in the 1890’s that the agrarian discontent that had been developingsteadily in the united states since about 1870 had been precipitated by theclosing of the internal frontier——that is，the depletion of available new landneeded for 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月著述美国约自18世纪70年月以来一向在持续不竭成长的农人不满，因为国内边远地域的封锁而更趋加剧——亦即是说，美国农业系统进一步扩展所必需的可资操作的新土地几近耗竭。

the early 1950’s，historians who studied preindustrial europebegan， for the first time in large numbers，toinvestigate more of the preindustrial european population than the or 3 percent who comprised the politicaland social elite：the kings，generals，judges，nobles，bishops，and localmagnates who had hitherto usually filled history books.

二十世纪五十年月早期，研究前工业化时代欧洲的史学家，初度以众多的人数，起头发芽拜访前工业化时代欧洲进口中的大大都，而非那些组成了政治与社会精英阶级的百分之二或三的进口，即国王、快要、法官、贵族、主教、以及处所上的达官显贵，而恰是这部门人一向到那时为止普遍充溢于史学著作。