gōng / rén / zhèng / zài / mó / shā / jīn / shǔ / biǎo / miàn / wèi / pēn / qī / zuò / hǎo / zhǔn / bèi工人正在磨砂金属表面,为喷漆做好准备。The workers are sanding the metal surface to prepare it for painting.