be smooth

The desk surface is smooth.

机の表面は滑らかです

The desk surface the carpenter worked on is smooth.

大工が机の表面は滑らかです

The desk surface the carpenter worked on with sandpaper is smooth.

大工が紙やすりで机の表面は滑らかです

The desk surface the carpenter sanded again and again is smooth.

大工が紙やすりで何度も机の表面は滑らかです

The desk surface the carpenter sanded again and again is smooth to the touch.

大工が紙やすりで何度も磨いた机の表面は滑らかです