此前先入为主，一直以为ST的含义是Spatial and Temporal。在课堂上，有学生问我这个含义，我以这个含义进行了解释。但心里感觉没有太大的把握，因此课后回来专门搜索了一下，发现网络上还有人问了这个问题：
https://stackoverflow.com/questions/7234679/what-is-st-in-postgis
从响应来看，最早ST的确是Spatial和Temporal的含义，但在PostGIS的官方文档中是作为Spatial Type进行解释的：
the standard spatial type (ST) prefix.
学习到了！
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