How Block xform works?

Hi, I understand that block in Rhino use a 4x4 matrix to control its transformation, but I am curious about what each of these matrix items means. Not sure if I understand it correctly, the first 3 rows seems to be related to x,y,z. Then what does the 4th row do?

Thanks in advance!

Hi @hali1 ,
Here is a similar topic:

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Thanks, it helps!