Users of the app can set standard criteria for their searches, such as the condition of the item and seller feedback, limiting search results to just those items they might purchase.

程序的用户可以定制他们的搜索标准，例如物品的状况和出售者的反馈，以将搜索结果缩小到他们可能会购买的范围内。

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Negative feedback loop — a closed path of action and reaction that self-limiting rather than self-reinforcing.

负反馈循环——在自我限制和自我增强的行为与反馈之间一条封闭的回路。

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Positive feedback loop----A closed path of action and reaction that is self-reinforcing rather than self-limiting.

正反馈循环——在行为和反映之间一条为自我增加而非自我抑止的一条封闭回路。

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