没有人质疑二氧化碳是为温室气体，和其绝佳吸收红外线辐射的能力。
No one doubts that carbon dioxide is a greenhouse gas, good at absorbing infra-red radiation.
氢分子发出红外线的原因是它们吸收了恒星发出的紫外线，或者是受到了恒星喷发的炽热气体流的加热。
The molecules emit the infrared light that they have absorbed ultraviolet radiation from the star or have been heated by the wind from the star.
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