All communication systems serve a purpose, a pragmatic function of some sort.
所有的通信系统都有一个目的，某种实用的功能。
But some luxury goods also serve a practical function.
当然，有的奢侈品也有实用功能。
Do duty or hold off ices; serve in a specific function.
履行义务或任工职；以特定功能服务。
Do duty or hold offices; serve in a specific function.
履行义务或任工职；以特定功能服务。
Designed to serve a specific function.
设计服务于特殊功能的。
A hash cannot serve this function because information is lost during the process.
散列无法提供此函数，因为信息在此过程中丢失。
A hash cannot serve this function because information is lost during the process.
散列无法提供此函数，因为信息在此过程中丢失。
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