Moreover, it is a very important method with study black hole states and the periodicity of the light curve to study their physical process.

同时，为了进一步了解黑洞的物理过程，通过研究黑洞态以及其光变曲线的周期性变化一直以来是一种十分重要的方法。

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Now, there are two ways to measure the stray light, respectively, surface source method (black spot method) and the point source method.

现有的杂散光测量系统分为两类，分别为面源法（黑斑法）和点源法。

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