18.Although these molecules allow radiation at visible wavelengths,where most of the energy of sunlight is concentrated,to passthrough,they absorb some of the longer-wavelength,infrared emissionsradiated from the Earths surface,radiation that would otherwise betransmitted back into space.
虽然这些分子允许可见波长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,亦即从地球表面辐射出的红外发射,这种辐射若不是二氧化碳的缘故就会被重新输送回太空。
19.The role those anthropologists ascribe to evolution is not ofdictating the details of human behavior but one of imposingconstraintsways of feeling,thinking,and acting thatcome naturallyin archetypal situations in any culture.
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。
20.A low number of algal cells in the presence of a high number ofgrazers suggested,but did not prove, that the grazers had removed mostof the algae.
在存在大量食草动物的同时却只有少量的水藻花粉囊,这暗示出但没能证明食草动物已吞噬了大部分水藻。
21.Studies by Hargrave and Geen estimated natural community graz-ingrates by measuring feeding rates of individual zooplankton species inthe laboratory and then computing community grazing rates for fieldconditions using the known population density of grazers.
由哈格雷夫和吉恩所进行的研究,对自然条件下的群落食草比例进行了估计,其手段是通过测量出实验室内单独的浮游动物种类的结食比例,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食草比例。
22.In the periods of peak zooplankton abundance,that is,in the latespring 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%.
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