当光从一个类星体划过太空，便会穿过将吸收线特征印在光谱上的气体云。
As light from a quasar travels through space, it passes through clouds of gas that imprint absorption lines onto its spectrum.
当光从一个类星体划过太空，便会穿过将吸收线特征印在光谱上的气体云。
As light from a quasar travels through space, it passes through clouds of gas that imprint absorption lines onto its spectrum.
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