how to draw a special structure shape

[jbwei]

dear all
now I want to draw a rectangle and then dig some circle hole on it. It looks like the picture below.

but I dont how to draw it.can anyone help me.Thanks a lot.

[bkhanaliloo]

Dear @jbwei

I guess you can define the rectangle and circles, and then assign etch material to circles.

I hope this answers your question.

Thanks

[jbwei]

dear bkhanaliloo
I know what you mean and now I can get the structure I want.Thanks so much