Make a rough sketch before you draw.

画画得先打个底子。

Now make a rough sketch of the story.

现在制作这个故事的粗略概述。

He chalked out a rough sketch of the design.

一种设计或图画的草图。

I wish I'd asked him to draw a rough sketch-map.

要是我请他画个大致的草图就好了。

Like all previous chapters, we start with a rough sketch.

如之前所有教程一样，我们从草图开始。