The infalling matter that emits X-rays does not fall into the black hole at a steady rate, but rather more sporadically, which causes an observable variation in X-ray intensity.

• 发出X辐射射线的下陷物质并不是以恒定的速率落向黑洞，而是偶然发生的，这导致了一种可以被观察到的X射线辐射强度的变化。