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.
1。不知道radiation到底指代什么?是emissions吗?为什么又是单数的?
最后这一句是什么的同位语?
2。杨鹏说: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,不是太能理解。
请指教,谢谢!
[此贴子已经被作者于2005-3-23 11:57:47编辑过] |