他们认识到用每次使用的成本比以瓶子为单位的价格要更有比较性。

They realize that cost per use is a much wiser comparison than cost per bottle.

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然而，当库允许任意的函数对象隐式地变成插槽时，这里出现了问题，因为插槽不再具有比较性。

However, this presents problems when the library allows arbitrary function objects to implicitly become slots, because slots are no longer comparable.

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最后导致要管理许多比较小的集群，而比较小的集群只具有比较低的可用性，因为可用性取决于集群的大小。

You end up managing many smaller clusters, and smaller clusters have lower availability, because availability is a function of the size of the cluster.

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