The more familiar customers are with the add-on item, the more likely they are to buy it.

顾客对附加商品越熟悉，购买的可能性越大。

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Add the item to your cart. Then click on the "Proceed to Checkout" button.

把物品添加到购物车，然后点击网页右边的“结算程序”按钮。

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That means on the other hand, if you add a new item and you wish to synchronize it with an external source, you MUST choose a category.

在另一方面，这就意味着当你建立了一个新的条目并且想要同步它的时候，你必须为它选择一个分类。

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