考研英語長難句詳解參考
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. 雖然這些分子允許可見波長(visible wavelength)的輻射 陽光的絕大部分能量就匯集于此 不受阻擋地穿透，但它們卻會吸收某些較長波長(longer-wavelength)，亦即從地球表面輻射出的.紅外發(fā)射(infrared emission)，這種輻射若不是二氧化碳的緣故就會被重新輸送回太空。
難句類型：復(fù)雜修飾、抽象詞
解釋：前面的分句中有一個不算很長的插入語，但是因?yàn)樗迦氲奈恢谜迷诠潭ù钆鋋llow something to do somthing中間，將allow和to分得很遠(yuǎn)，所以讀起來讓人感覺很不舒服。
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的同位語。其中的otherwise是副詞作狀語，表示如果后面的分句所說的they absorb some of the longer-waverlength, infrared emissions不發(fā)生時的后果。
意群訓(xùn)練：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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