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 \(U\).
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For several years, Spotlight's tag index has been unreliable. Querying for a file type and a tag often returns only a subset of the most recent files with the tags. Rebuilding the entire Spotlight index does nothing to alleviate this. The only cure is to relaunch the Finder. (There's also, 13 years after its introduction, no good, supported and documented command line interface or API to enumerate, add or remove tags (aside from those assuming that they are just the seven colors of labels). Just saying.)
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乔忠良：不止焊接场景，在工业具身高精度任务下，难点在于让模型知道物理世界的真实尺度。
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