打磨：运用耐水砂纸蘸水打磨，这可有效避免铜版粉尘飞入肺中。

Sanding: use wet sandpaper with water, this avoids copper dust to fly straight to your lungs.

youdao

打磨：运用耐水砂纸蘸水打磨，这可有效避免铜版粉尘飞入肺中。

Sanding: use wet sandpaper with water, this avoids copper dust to fly straight to your lungs.

youdao