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1. Although these molecules allow radiation at visible wavelengths， where most of the energy of sunlight is concentrated，to pass through，they absorb some of the longer-wavelength， infrared emissions radiated from the Earth‘s surface，radiation that would otherwise be transmitted back into space. (4)
虽然这些分子允许可见波长(visible wavelength)的辐射——阳光的绝大部分能量就汇集于此——不受阻挡地穿透，但它们却会吸收某些较长波长(longer-wavelength)，亦即从地球表面辐射出的红外发射(infrared emission)，这种辐射若不是二氧化碳的缘故就会被重新输送回太空。
难句类型：复杂修饰、抽象词
解释：前面的分句中有一个不算很长的插入语，但是因为它插入的位置正好在固定搭配allow something to do somthing中间，将allow和to分得很远，所以读起来让人感觉很不舒服。
后面的分句中的最后一行radiation that would otherwise be transmitted back into space是其前面的infrared emissions的同位语。其中的otherwise是副词作状语，表示如果后面的分句所说的they absorb some of the longer-waverlength， infrared emissions不发生时的后果。
意群训练：Although these molecules allow radiation at visible wavelengths， where most of the energy of sunlight is concentrated， to pass through， they absorb some of the longer-wavelength， infrared emissions radiated from the Earth's surface， radiation that would otherwise be transmitted back into space.
2. The role those anthropologists ascribe to evolution is not of dictating the details of human behavior but one of imposing constraints—ways of feeling，thinking，and acting that "come naturally" in archetypal situations in any culture. (4)
这些人类学家所归诸于生物进化的作用，不是规定人类行为的种种细节，而是将各种限制强加于人类——即在任何文化的典型情景中都会“自然表露”的情感、思维、以及行动方式。
难句类型：复杂修饰、省略
解释：尽管我们很熟悉the role of something的这种表达，但本句中the role of被作者胜利很活。首先，在role后面有一个省略了引导词that的定语从句(因为role在从句中作ascribe的宾语)，这样就把role和系动词is隔得很远。其次，but前面的句子的主要结构The role is not of doing something其实是The role is not the role of doing something的省略形式，因为后面的the role与前面的完全重复，如果不把它省略掉，谁看到都要觉得啰嗦。因为同样的道理，but之后的one of imposing constraints实际上是is one role of imposing constraints的省略形式。
意群训练：The role those anthropologists ascribe to evolution is not of dictating the details of human behavior but one of imposing constraints— ways of feeling， thinking，and acting that "come naturally" in archetypal situations in any culture.
Certainly Newton considered some theoretical aspects of it in his writings, but he was reluctant to go to sea to further his work.
For most people the sea was remote, and with the exception of early intercontinental travellers or others who earned a living from the sea, there was little reason to ask many questions about it , let alone to ask what lay beneath the surface.
The first time that the question “ What is at the bottom of the oceans?” had to be answered with any commercial consequence was when the laying of a telegraph cable from Europe to America was proposed.
At the early attempts, the cable failed and when it was taken out for repairs it was found to be covered in living growths, a fact which defied contemporary scientific opinion that there was no life in the deeper parts of the sea.
1. Studies by Hargrave and Geen estimated natural community grazing rates by measuring feeding rates of individual zooplankton species in the laboratory and then computing community grazing rates for field conditions using the known population density of grazers. (5)
由哈格雷夫(Hargrave)和吉恩(Geen)所进行的研究，对自然条件下的群落捕食速率进行了估计，其手段是通过测量出实验室内单独的浮游动物种类的捕食速率，然后利用已知的食草动物种群密度，计算出实地状况下的群落捕食速率。
难句类型：复杂修饰
解释：本句对阅读者的阅读能力提出了更高的要求，不但要求读者读清楚句子的复杂的结构，而且对读者的词汇能力也提出了更高的要求。
By以前结构无需解释，by以后有两个作介词宾语短语的动名词结构，measuring和后面表示并列和顺接的and then之后的computing,说的是计算方法;前一个measuring说的是先算出实验室中浮游动物品种的单位捕食速率，后面的 computing前其实省略了一个by,而且在这个动名词结构中还包括一个分词结构using the known population density of grazers,用已知的捕食者的种群密度计算出其野外的群体捕食速率。整个的by以后的计算过程简单了就是：实验室单位速率×野外密度=野外群体速率。
另外本句中的词汇也颇有迷惑性;虽然没有太难的单词，但是很多单词都是同义词和反义词，容易让人读混(斜线分隔同义词，冒号分隔反义词)。
estimate/measure/compute; feeding rates/grazing rates; zooplankton/grazers; natureal/field; laboratory community; individuall
意群训练：Studies by Hargrave and Geen estimated natural community graz-ing rates by measuring feeding rates of individual zooplankton species in the laboratory and then computing community grazing rates for field conditions using the known population density of grazers.
2. In the periods of peak zooplankton abundance,that is,in the late spring and in the summer,Haney recorded maximum daily community grazing rates,for nutrient-poor lakes and bog lakes,respectively,of 6.6 percent and 114 percent of daily phytoplankton production. (3+)
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%。
难句类型：插入语
解释：句中有两组插入语，每组两个插入语，尤其是第二组，把rate of从中间劈开。不过因为句义尚好理解，所以本句只是有一点别扭，但不算太难。
意群训练：In the periods of peak zooplankton abundance,that is,in the late spring and in the summer,Haney recorded maximum daily community grazing rates,for nutrient-poor lakes and bog lakes，respectively,of 6.6 percent and 114 percent of daily phytoplankton production.
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