qiáng / shàng / de / wū / zì / hěn / nán / xǐ / bái / huàn / yí / miàn / qiáng / zhǐ / kě / néng / gèng / fāng / biàn

墙上的污渍很难洗白，换一面墙纸可能更方便。

The stain on the wall is difficult to wash clean, so replacing the wallpaper may be easier.