Coffee shops - how many times have you seen a cluster of corporate or franchise coffee shops nested close by, with a local boutique or two in the mix as well?
咖啡店——你也应该常常看到许多的咖啡连锁店聚集在一起，也许中间仅隔者一两家的精品店。
A cluster consists of one primary server and a mix of three different types of secondary servers.
一个集群包含有一个主服务器和三个不同类型的备用服务器。
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