Hi hao qiqi0, welcome here!
The forum is English speaking, so use it please
The caustics are not yet supported in CentiLeo. So in order to get no noise from them we blur this visual effect.
In your image the cup internal reflections are dark. I think you have to make sure that Relfection.weight = 1 and Reflection.Color = pure 100% white for your material.
There is also "Is Liquid" option for Transmission channel, it should be enabled for the mesh of liquid if it overlaps the mesh of cup glass.
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