在V 3中，发布者现在可以在创建新实体时指定他们自己的键值了。
In V3, it is now possible for publishers to specify their own key values when they create new entities.
然而真正神奇的是，我们能够创建无限数量的索引，每一个代表它自己的键值并包含一个令牌副本。
The real magic, though, is that we can create an infinite number of indices, each one representing its own key and containing a copy of the token.
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