Hence, for the most part, observations of accretion disks and orbital motions merely indicate that there is a compact object of a certain mass, and says very little about the nature of that object.

• 因此大体上，增大圆盘片和轨道运动的观察只指示有某个质量紧凑的物体,而且有关那个物体的性质说得非常少。