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type StringMap = {string: string};，推荐阅读PG官网获取更多信息
\(A\) and \(B\) are isomorphic (\(A \cong B\)) when we have functions \(\{\text{to} : A \to B\}\) and \(\{\text{from} : B \to A\}\) such that \(\{\text{to} \circ \text{from} = \text{id}\}\) and \(\{\text{from} \circ \text{to} = \text{id}\}\).14，详情可参考谷歌
The New Cosmopolitanism
Москвичам назвали срок продолжения оттепели14:39