以上是某双星系统的掩星过程，下面是双星叠加的亮度波动线。
Eclipses observed in certain binary star systems are also mutual occultations. During an occultation, the beginning or disappearance of the star is called immersion, the exit emergence. When the star in background, without being hidden, approaches the star in foreground, it is said that there is appulse.
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置顶卡
变色卡
千斤顶
显身卡