Amazon 和 Kayak 提供过滤来帮助用户减少结果数量 这样设计很有效但是由于提供给过滤项空间的限制 局限性也很明显 当页面载入的时候只有前面几个过滤项能够看见.
Amazon and Kayak offer filters to enable users to reduce many results to a few. This can be very effective, but there are obvious constraints due to the limited space available for each filter.
如第1部分所述，任何超级集群拓扑结构都存在限制和局限性。
As mentioned in Part 1, there are restrictions and limitations with any super cluster topology.
然而，该战略也有一定的局限性，包括限制消费者每年只能购买一张这样的卡片。
There are some limitations, however, including limiting consumers to just one such card purchase per year.
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