考研英语长难句详解参考
26. 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. 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 Earths surface， radiation that would otherwise be transmitted back into space.
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