We sell all clothes at very good prices.We haveWe sell all clothes at very good prices.We have hats at a very good price.为什么第一句中的price加s,第二句中的不加?

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We sell all clothes at very good prices.We have
We sell all clothes at very good prices.
We have hats at a very good price.
为什么第一句中的price加s,第二句中的不加?

词性不一样,第一个是数次,多个加s第二个是名词价格