托福阅读的一段原文，为什么constituting后面接“， for example.....”的形式，这属于什么语法部分？
EachSMSAwouldcontainatleast(a)onecentralcitywith50,000inhabitantsormoreor(b)twocities...
Each SMSA would contain at least (a) one central city with 50,000 inhabitants or more or (b) two cities having shared boundaries and constituting, for general economic and social purposes, a single community with a combined population of at least 50,000, the smaller of which must have a population of at least 15,000.
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，for general ... purposes, 这个应该是插入语
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