“草图”造句

用不同颜色的毡头笔画草图，以免搞混。
Use different colours of felt pen on your sketch to avoid confusion.

草图应该是最终绘画的某种演练。
The sketch should be a kind of rehearsal for the eventual painting.

你最好还是画张这栋建筑的草图.
You'd better block in a plan of the building.