比尔和他的团队使用一种被称为“活动镜”的光学仪器，这是一种在天文望远镜的种类中用来发现新出现的恒星和遥远星系的仪器。
Bille and his team work with an optical instrument called an active mirror—a device used in astronomical telescopes to spot newly emerging stars and far distant galaxies.
活动星系核的光学谱变化与光变时标之间是否存在某种关系？
AGN changes in the optical spectra and light changes between standard Is there some relationship?
结果表明：这两种模型是定性解释活动星系核光学波段光变的合理模型。
The results show that these two models can qualitatively explain the AGN variability in the optical band.
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