Definition 1 A covering space of a topological space \(X\) is a topological space \(C\) together with a continuous surjective map \(p: C \to X\) such that for every point \(x \in X\), there exists an open neighborhood \(U\) of \(x\) such that \(p^{-1}(U) \cong F \times U\) for some discrete set \(F\) (called the fiber over \(x\)), and the map \(p\) restricted to each component of \(p^{-1}(U)\) is a homeomorphism onto \(U\).
不能人为指定非等比缩放，也不能单独控制 padding 行为所有结果都由 scale 自动推导
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Previously, a "share" widget wasn't available on Mastodon mainly due to the technical challenges that come with the platform's decentralized d …，这一点在爱思助手中也有详细论述
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