tourism能不能加s?They are all good tourist spots for tourism.tourism能不能加s?

tourism能不能加s?They are all good tourist spots for tourism.tourism能不能加s? What's medical tourism?medical tourism world's responsible tourism American能不能加s “America”能不能加“s”? cattle能不能加s Start能不能加s list能不能加s tourism Tourism tourism with能不能加s 为什么 holiday后面能不能加s? They forget how much tourism can help the country’s economy这句话怎么翻译,how much充当什么成分 haddock and pollock live off Canada's each coast.What ar they? 英语中不可数名词能不能加s? 不可数名词能不能加S举例 yuan能不能加s,为什么?急!