完美散列函数是一种在时间和空间方面都十分高效的静态搜索集实现。

Perfect hash functions are time- and space-efficient implementations of static search sets.

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显然，要让这个过程生效，发送方和接收方必须在传送开始前就即将使用的散列函数达成一致。

Clearly, for this process to work, the sender and receiver must agree on the hash function that will be used before transmission begins.

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然而，数组和散列更为复杂。

Arrays and hashes, however, are more complex.

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