Green and yellow part while using slic3r to generate Gcode

[ychen488]

While I'm using the slic3r to generate the Gcode, on the preview screen, the object was separated in to two parts, one is yellow and the other is green. What does it mean?
3D view: a circle. I simply want to draw a circle. However, a small yellow circle appeared in it automatically, and cannot be deleted

There's no yellow part for this:

This picture confuses meeeeeeee

Can anyone help me with this problem?

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[vetsen]

It looks like a brim or skirt is tuned on in your slic3r settings. Go to skirt and brim and enter zero for loops and zero the brim settings.