Can't find explanation for the function "MeDCMotor motor_()" imported from <MeMCore.h> library

[WilsonTheProgrammer]

I am trying to learn arduino by converting mblock codes into arduino ide. I encountered the function "MeDCMotor motor_9(9)",which was imported from the library <MeMCore.h> ,and have failed to find explanations of how this function works. How does this work? or, where can i find the introduction of this function?

Thank you for reading this question patiently.

I tried searching "memcore.h library", but no explanation appeared in the results.