stain smear

例句：

1. 1. The paint on the wall has a lot of visible stains.
   墙上的油漆有很多明显的污点。
2. 2. His clothes have been stained by the rain.
   他的衣物被雨水染上了污渍。
3. 3. The stain on the table is difficult to remove.
   桌子上的污渍很难去除。