The climate change we are hastening could one day leave us with forests that emit more carbon than they absorb.

因人类而不断加剧的气候变化或许终有一日让森林的碳排放量超过其吸收量。

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The water exists as huge gaseous clouds that absorb and emit light, allowing powerful telescopes to detect them across the mind-boggling distances of space.

水以巨大的气态云团的形式存在，吸收并发出光线，让强大的望远镜可以穿过令人难以置信的空间距离检测到它们。

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Different elements or compounds absorb and emit different colors or wavelengths of light, and by studying a star's spectrum, one can divine what its composition might be.

不同的元素或化合物吸收并释放不同颜色的光波，通过对一个恒星的光谱进行研究，我们能够推测它可能的成分。

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The new research also suggests that as trees die, they actually emit more carbon than they absorb.

CNN: Global warming threatens forests, study says

This ingenious technique which won its inventors, one of whom was Steven Chu, now America's energy secretary, a Nobel prize works by bombarding an object with laser light at a frequency just below that which it would readily absorb and re-emit if it were stationary.

ECONOMIST: An old thought experiment may soon be realised

For instance, the Hadley Centre for climate research in the UK, published research only this week suggesting that forests will speed up climate change in the future, as the soil will start to emit more greenhouse gases than the trees absorb as the temperature builds up.

BBC: Carbon-trading in Bolivia