I rounded off the corners with sandpaper.

我用棱角打磨光滑。

Burn off the old paint,fill any cracks in the woodwork,and rub down well with sandpaper.

将这件木器原来的漆烧掉,填补好上面的裂缝,再用磨光。

Take a piece of sandpaper and round off the edges of the frame.

拿张框架的边磨圆。

He rubbed the woodwork down with sandpaper.

他用木结构的部分打磨光滑。