他们不卖可以用英文表示为 "They don't sell it"。这是一句简单的英语短语，由两个单词组成："they" 和 "don't sell"。"They" 是主语，表示"他们"； "don't sell" 是谓语，表示"不卖"。
例句：
They don't sell that brand of cereal at this store.
这家商店不卖那个品牌的麦片。
I was looking for a new book, but they don't sell it here.
我想找一本新书，但是这里不卖。
I was wondering if they sell this product in your store, but I was told they don't sell it.
我想知道你们店里是否售卖这种产品，但是被告知不卖。