The spectral overlap was discovered among emission lines of some elements and resonance lines or non-resonance lines of other elements.
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活动星系核的一些重要性质包括：它们具有恒星状的外表，随时间变化的连续光谱，以及宽的发射线等。
Some of the most important properties of AGN are that they are star-like objects, have time-variable continuum flux, and the spectra include broad emission lines.
The Japanese electricians who bravely strung wires this week to all six reactor buildings at a stricken nuclear power plant succeeded despite waves of heat and blasts of radioactive steam.
