As I've seen at my grandma's nursing home, they can spend hours trying to clean what seems like a dirty tabletop that is actually just a speckled pattern.

正如我在祖母的疗养院看到的那样，他们可能会花几个小时试图清洁看起来脏兮兮的桌面，但实际上只是有斑点的图案。