You should know that they are getting a marked increase in sales.

sales 是名词 sale 的复数形式，sale 的意思是"销售、出售"。 marked 是形容词，意思是"显著的、明显的"，常用来形容变化或差异。 increase 是名词，意思是"增长、增加"。 marked increase in sales 指"销售额的显著增长"。